OnSong lets you build your own library as well as receive songs from others when you're performing sets. This can have the unintended consequence of duplicate songs in your library. OnSong's
Remove Duplicates tool can help you remove additional songs from your library.
The Remove Duplicates tool works by finding songs that match by title and the optional artist tag. For instance, if you have multiple songs called "Brown-Eyed Girl" by "Van Morrison", they will be considered duplicates. This is based on exact match so two "Brown-Eyed Girl" songs with different artists, or one with no artist, will not be considered a match. If more than one song is found, OnSong keeps the one that was most recently modified and removes the others.
To access the Remove Duplicates tool, tap on the gear icon in the Menubar to open the Utilities Menu and then tap on Tools. The Remove Duplicates button is located there. You will be prompted to confirm removing duplicate songs. Once confirmed, OnSong will remove duplicates from your library.
In the event that OnSong removed songs that you did not want to have removed, you can retrieve those using the Undelete Songs tool. To do this, choose the Undelete Songs option from the same Tools menu. You can then select the songs you want to undelete and tap the Done button to have them restored to your All Songs collection.