A MEDLEY is a type of composite musical work comprised of the continuous and sequential combination of
preexisting musical works or excerpts from preexisting musical works.
A medley work is also considered a derivative work under copyright law. As such, the creation and distribution of a medley
work requires the approval of ALL rightsholders of each of the preexisting musical works included in the medley. Only
approved medleys are eligible for the compulsory blanket license established by 17 U.S.C. ยง 115 that the MLC Administers.
Source: Medley Best Practices by the MLC
Rights holders can choose to have your medley taken down if the rights are not cleared prior to release. A Medley that is distributed digitally is not covered under a standard mechanical license.