When starting out, first load some music into the empty Replayer app.
Image: Loading a media file or a compilation into Replayer
You can use:
Many modern media formats are supported. By loading a media file, you actually start creating your own compilation.
When you work with an organisation or a choir/band leader, they might provide you with a ready-made compilation (as .ZIP file) with all tracks for your practice or rehearsal already contained. Just load the compilation file and start practicing, for example by using the loop modes.
You can try this example compilation with 5 individual tracks. The tracks are in different audio formats, and loaded from the online Replayer library.