Fox's new TV show "Empire" is becoming increasingly popular with each new episode that airs. The TV show, which stars Terrence Howard and Taraji P. Henson, centers around a hip-hop record label trying to go public, while dealing with various artists on the label. Thus, there's a lot of original music on the TV show (similar to "Glee"), much of which can be purchased on iTunes or streamed on Spotify following each episode. This is part of the issue that led Diddy to reportedly ban his son from appearing in Lee Daniels' show.
Quincy had reportedly been guaranteed a role in the show, but when Diddy learned that he had to sign over the rights to the music he did for the show to Fox, he pulled him out. According to Page Six's source, "Diddy kicked up a huge stink and called all the top brass at 20th Century Fox TV to get them to change their rules over music rights," but that didn't work. "He said there was no way his son was signing over his intellectual property. So he banned him from the show."
Apparently the show is still considering Quincy for a role in the second season, but Diddy would have to be lenient on the song rights.