In spite of some international copyright treaties, determining which music is in the public domain is complicated by of national copyright laws that may be applicable. US copyright law formerly protected printed music published after 1923 for 28 years and with renewal for another 28 years, but the Copyright Act of 1976 made renewal automatic, and the Digital Millennium Copyright Act changed the calculation of the copyright term to 70 years after the death of the creator. Recorded sound falls under mechanical licensing, often covered by a confusing patchwork of state laws; most cover versions are licensed through the Harry Fox Agency. Performance rights may be obtained by either performers or the performance venue; the two major organizations for licensing are BMI and ASCAP. Two online sources for public domain music are IMSLP (International Music Score Library Project) and Choral Public Domain Library (CPDL).

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