<p><strong>Abstract: </strong>This research is a new breakthrough in Indonesia, which integrates the approach of Cognitive Behavior Therapy (CBT) - as a conventional counseling approach with music therapy as expressive techniques in counseling. The aim of this study is to determine the effectiveness of group counseling service implementation of CBT with active music therapy technique to improving self-efficacy of millennials students. This study used quasi-experimental design (pretest, posttest, and follow-up). Group counseling was conducted for 5 meetings (each meeting was 100 minutes), and follow-up was performed after 2 weeks of treatment. Subject selection using purposive sampling technique that is based on inclusion criteria and level of self-efficacy obtained from self-efficacy scale. The results of this research showed that group counseling of CBT with active music therapy technique was significantly effective in improving self-efficacy of millennials<em> </em>students at pretest vs. posttest, pretest vs. follow-up, and posttest vs. follow-up.</p><p><strong>Abstrak: </strong>Penelitian ini merupakan terobosan baru di Indonesia yang mengintegrasikan pendekatan <em>Cognitive Behavior Therapy</em> (CBT) - sebagai pendekatan konseling konvensional dengan <em>music therapy</em> sebagai<em> expressive techniques in counseling</em>. Tujuan penelitian ini ialah untuk mengetahui efektivitas konseling kelompok CBT dengan teknik <em>active music therapy</em> untuk meningkatkan <em>self-efficacy</em> mahasiswa <em>millennials </em>penyusun skripsi. Penelitian ini menggunakan desain quasi-eksperimental (<em>pretest</em>, <em>posttest</em>, dan <em>follow-up</em>). Konseling kelompok dilaksanakan selama 5 pertemuan (tiap pertemuan 100 menit), dan <em>follow-up</em> dilakukan setelah 2 minggu diberikan <em>treatment</em>. Pemilihan subjek menggunakan teknik <em>purposive sampling</em> didasarkan pada kriteria inklusi dan tingkat <em>self-efficacy</em> yang diperoleh dari <em>self-efficacy scale</em>. Hasil penelitian menunjukkan bahwa konseling kelompok pendekatan CBT dengan teknik <em>active music therapy </em>secara signifikan efektif untuk meningkatkan <em>self-efficacy</em> mahasiswa <em>millennials</em> pada saat <em>pretest vs. posttest</em>, <em>pretest vs. follow-up</em>, dan <em>posttest vs. follow-up</em>. </p>