Song is collection of recorded song parts along with specific drum type and drum configuration. Saved songs are found in user's home, in directory ~/save_song.
Song names look like "101.Disco", "108.Blues". Names include unique number from 100 to 999 and suffix showing drum configuration name.
Song has commands for stopping song instantly or at the end of the longest loop in the currently playing song part.
In song view songs may be saved, loaded, deleted, initialized and assigned drum configuration (e.g. Disco, Blues, ...).
Also, there are undo/redo actions and loop modifications (muting, reversing) they are saved, as well as drum parameters.