SecondHandSongs (or Second Hand Songs) is a collaborative website that maintains a global database of mainly of original works. It also contains information about adaptations and samples. The website allows performers and volunteer curators to add songs and update their metadata. 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.
As of 2025, the site's most covered musical composition is "Stille Nacht, heilige Nacht" written by Joseph Mohr and Franz Gruber in 1818, which has been covered 4,229 times.
A work is an equivalence class, i.e. a list, of performances of the same underlying song. Each performer has, at most, one performance for each work in the database.
Later, it released the SHS100k dataset for machine learning, with 100k covers of 10k works. This has since become a benchmark for cover-song identification.
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