When a music group breaks up, what happens to the trademark? The music industry is full of stories about bad breakups of bands at their best, as well as dispirited dissolutions after disappointing downturns. Sometimes, multiple parties claim the right to use the name of the band as a trademark for ongoing musical pursuits. This chapter considers how courts in the United States handle trademark fights over band names. It also analyzes largely forgotten state “Truth in Music” Acts that aim to keep legacy performing groups and their managers honest by requiring them to tour with at least one original recording musician—or identify themselves as tributes, rather than the genuine article. This commitment to “truth” about the origin of these bands seems consistent with the purpose of federal trademark protection to make “actionable the deceptive and misleading use of marks” and “to prevent fraud and deception” in commerce. But three recent US Supreme Court cases, United States v. Alvarez, Matal v. Tam, and Iancu v. Brunetti, indicate that courts might apply constitutional scrutiny to laws like Truth in Music acts that punish lies, even if those laws are consistent with standard justifications for trademark protection. Evaluating Truth in Music Acts in light of these cases may help us predict how much of the current trademark regime could be swept away on a rising tide of judicial scrutiny.