Probe Tone Paradigm Reveals Less Differentiated Tonal Hierarchy in Rock Music

Krumhansl and Kessler’s (1982) pioneering experiments on tonal hierarchies in Western music have long been considered the gold standard for researchers interested in the mental representation of musical pitch structure. The current experiment used the probe tone technique to investigate the tonal hierarchy in classical and rock music. As predicted, the observed profiles for these two styles were structurally similar, reflecting a shared underlying Western tonal structure. Most interestingly, however, the rock profile was significantly less differentiated than the classical profile, reflecting theoretical work that describes pitch organization in rock music as more permissive and less hierarchical than in classical music. This line of research contradicts the idea that music from the common-practice era is representative of all Western musics, and challenges music cognition researchers to explore style-appropriate stimuli and models of pitch structure for their experiments.

Improvisation: A novel tool to study musicality

Humans spontaneously invent songs from an early age. Here, we exploit this natural inclination to probe implicit musical knowledge in 33 untrained and poor singers (amusia). Each sang 28 long improvisations as a response to a verbal prompt or a continuation of a melodic stem. To assess the extent to which each improvisation reflects tonality, a core organizational principle of musicality, we developed a new algorithm that compares a sung excerpt to a probability density function representing the tonal hierarchy of Western music. The results show signatures of tonality in both nonmusicians and individuals with congenital amusia, who have notorious difficulty performing musical tasks that require explicit responses and memory. The findings are a proof of concept that improvisation can serve as a novel, even enjoyable method for systematically measuring hidden aspects of musicality across the spectrum of musical ability.

Crossmodal Correspondence Between Tonal Hierarchy and Visual Brightness: Associating Syntactic Structure and Perceptual Dimensions Across Modalities

Crossmodal correspondences (CMC) systematically associate perceptual dimensions in different sensory modalities (e.g., auditory pitch and visual brightness), and affect perception, cognition, and action. While previous work typically investigated associations between basic perceptual dimensions, here we present a new type of CMC, involving a high-level, quasi-syntactic schema: music tonality. Tonality governs most Western music and regulates stability and tension in melodic and harmonic progressions. Musicians have long associated tonal stability with non-auditory domains, yet such correspondences have hardly been investigated empirically. Here, we investigated CMC between tonal stability and visual brightness, in musicians and in non-musicians, using explicit and implicit measures. On the explicit test, participants heard a tonality-establishing context followed by a probe tone, and matched each probe to one of several circles, varying in brightness. On the implicit test, we applied the Implicit Association Test to auditory (tonally stable or unstable sequences) and visual (bright or dark circles) stimuli. The findings indicate that tonal stability is associated with visual brightness both explicitly and implicitly. They further suggest that this correspondence depends only partially on conceptual musical knowledge, as it also operates through fast, unintentional, and arguably automatic processes in musicians and non-musicians alike. By showing that abstract musical structure can establish concrete connotations to a non-auditory perceptual domain, our results open a hitherto unexplored avenue for research, associating syntactical structure with connotative meaning.

Absolute pitch ability is not associated with advantage in musical tension processing

Absolute pitch (AP), a superior ability of pitch letter naming in the absence of a reference note, has long been viewed as an indicator of human musical talent and thus as evidence for the adaptationist hypothesis of music evolution. Little is known, however, whether AP possessors are superior to non-AP possessors in music processing. The present study investigated whether the AP ability facilitates musical tension processing in perceptual and experienced tasks. Twenty-one AP possessors and 21 matched non-AP possessors were tested using novel melodies in C and non-C contexts. Results indicated that the two groups provided comparable ratings of perceived and felt tension for melodies in both contexts. While AP possessors demonstrated lower accuracy with longer reaction time than non-AP possessors in naming movable solfège syllables for pitch in the pretest, their tension rating profiles showed a similar tonal hierarchy as non-AP possessors in regard to the stability of the ending tones of the melodies in both major and minor keys. Correlation analyses suggested that musical tension ratings were not significantly related to performance in pitch letter, movable solfège syllable naming, pitch change detection threshold, or pitch direction discrimination threshold for either group. These findings suggest that pitch naming abilities (either pitch letter or movable solfège syllable naming) do not benefit processing of perceived or felt musical tension, providing evidence to support the hypothesis that AP ability is not associated with advantage in music processing.

Probe Tone Paradigm Reveals Less Differentiated Tonal Hierarchy in Rock Music

Krumhansl & Kessler’s (1982) pioneering experiments on tonal hierarchies in Western music have long been considered the gold standard for researchers interested in the mental representation of musical pitch structure. The current experiment used the probe tone technique to investigate the tonal hierarchy in classical and rock music. As predicted, the observed profiles for these two styles were structurally similar, reflecting a shared underlying Western tonal structure. Most interestingly, however, the rock profile was significantly less differentiated than the classical profile, reflecting theoretical work that describes pitch organization in rock music as more permissive and less hierarchical than in classical music. These results contradict the assumption that music from the common-practice era is representative of all Western musics, and challenges music cognition researchers to be more thoughtful when choosing stimuli and models of pitch structure for their experiments.

The neo-Pythagorean view of musical structure in the light of music psychology

The aim of this paper is to show why the neo-Pythagorean claims concerning musical structure are out-of-date and require the incorporation of contemporary psychological knowledge. The neo-Pythagorean view of musical structure has been analyzed and confronted with the contemporary neuropsychological view of music perception. It has been also suggested that musical intervals exist solely in human brains as a kind of interpretation of acoustic sounds. These sounds can be interpreted differently depending on many factors, which the popular speech-to-song illusion clearly illustrates. Another example of neo-Pythagorean ideas about musical structure that need psychological knowledge is tonal hierarchy, which also exists solely in human brains. Therefore, the popular musicological description of musical intervals in terms of mathematical proportions is misleading. It has been proposed that current musicological theories should always be confronted and consistent with contemporary psychological knowledge. This implies closer cooperation between musicology and the psychology of music.

Probing the minor tonal hierarchy

One facet of tonality perception that has been fairly understudied in the years since Krumhansl and colleagues’ groundbreaking work on tonality (Krumhansl & Kessler, 1982; Krumhansl & Shepard, 1979) is the music theoretical notion that the minor scale can have one of three distinct forms: natural, harmonic, or melodic. The experiment reported here fills this gap by testing if listeners form distinct mental representations of the minor tonal hierarchy based on the three forms of the minor scale. Listeners heard a musical context (a scale or a sequence of chords) consisting of one of the three minor types (natural, harmonic, or melodic) and rated a probe tone according to how well it belonged with the preceding context. Listeners’ probe tone ratings corresponded well to the minor type that had been heard in the preceding context, regardless of whether the context was scalar or chordal. These data expand psychological research on the perception of tonality, and provide a convenient reference point for researchers investigating the mental representation of Western musical structure.

Tonal hierarchy representations in auditory imagery

Two experiments investigated psychological representations of musical tonality in auditory imagery. In Experiment 1, musically trained participants heard a single tone as a perceptual cue and built an auditory image of a specified major tonality based on that cue; participants’ images were then assessed using judgments of probe tones. In Experiment 2 participants imaged a minor tonality rather than a major one. Analysis of the probe tone ratings indicated that participants successfully imaged both major and minor tonal hierarchies, demonstrating that auditory imagery functions comparably to auditory perception. In addition, the strength of the major tonal image was dependent upon the pitch and tonal relations of the perceptual cue and the to-be-imaged tonality. Finally, representations of minor tonal hierarchies were less robust than those of major ones, converging with perceptual evidence that minor tonalities are less psychologically stable than major tonalities.