There are several repeatModes like
MPMusicRepeatModeOne, MPMusicRepeatModeAll
So instead of setting it to MPMusicRepeatModeDefault
set it to other mode as you want. (See reference link for more ...).
Also, there are several shuffleModes like
MPMusicShuffleModeOff, MPMusicShuffleModeSongs, MPMusicShuffleModeAlbums
In both - repeatMode and shuffleMode, the default
mode indicates you not set them explicitly. So set them to other modes as you want.