Add a suggested music playlist installed into the app as an option for each Kriya.
You could choose to pick your own music selection or the already prepared playlis
This is somewhat challenging due the copyright implications, but be are actively looking for the best way to implement this functionality.
Better yet - provide the option to play the same track through the whole kriya. The default seems to be adding a new/different track for each segment of the kriya. As is often the case, I use one mantra for the whole kriya and do not want to go back to the beginning of the track for each different segment of the kriya. To work around your default music option - I start a track from the Music player, then open Kundalini Mobile and begin the kriya. I do not add the music from within the KM app because I do not want to hear the beginning over and over again.