I use the Road to Fame mod. Erik reaps a great deal of money through song royalties, (§200.00 per song) plus he can put out albums reaping §750.00 per album. He's written eight songs, thus far, the original way, too. But it is vexing that we must wait for a week (which is often longer than said week) in order to license another song. Who works like that in the Real World? Face/palm. There should be no reason for the prolific musician to have to wait. EA, please fix this little 'oversight'. :)
ETA: He can perform concerts, live or 'away', for a cool §10,000.00 and he's so 'hot' that magazines want him on their covers. Each photosession which can be via a rabbit hole, or you can have the photographer and team come to the Sim, for a cool §10,000.00 when your Sim has maxed out the modeling skill. Money to be had with this mod. I won't play my game without it.
ETA again: I goofed on the amount of Simoleons per album and put in how much per song.