if my band became famous and then people started likeing other music so we started playing that even though we dont like that kind of music just for more money
Someone who builds their own credit by rapping cool lines like "fuck the police" then sells out by making weak movies in which he plays a police officer.
Example: Obama seemed like a good choice when he was running on a platform of change but then he became an ice cube sellout
In the music industry a sell out is someone that only makes music to make money and not cos they like making music (apart from the fact the get money from it)