For an easy way to get money make sure you have 3 groupies, the third rocket, handstand, and pole vault. once you have those try to get as clost to a perfect jump as possible then tilt your shopping kart so that you are facing straight upwards. also try to do a handstand while you do that. then wait till your rocket stops working then do one flip (while doing the handstand) and when you see blue sky again stop the hand stand and get your kart balanced then when you hit the ground do as many pole vaults as possible. Its not easy to do, but if you are successful you should be getting almost $20000 per jump. Rate up so others can see.
You should be able to make albums of certain groups of songs, Give it a name and Design the cover. Also there should be more places to rent that allow you to play more than 3 songs.