SecondHandSongs (or Second Hand Songs) is a collaborative website that maintains a global database of mainly cover versions of original works.

[1] It includes links to freely accessible recordings of the covers, and external identifiers for those works and performances in other databases.

As of 2021, it included roughly a million covers of 100,000 original works, and was cross-referenced by MusicBrainz.

[2][3] Data are contributed and edited by the active community, so the exact size of the database has changed over time.

In 2011, the Million Song Dataset project released a SecondHandSongs subset (an intersection of SHS and MSD data).