How much time did the flash take, how much time did the songs take. How good is the flash and how good is the music. Also is it worth revenue sharing.
So say your flash is like the next tankmen, then maybe keep each song at around 1-5% a piece, but if the song/s are really really awesome and the user is not very renown, maybe 5-10%
But if the flash was like turd of the week, dont even worry about revenue sharing. Or are you using a song with like 1 million views and is made by paragonx9 or something, dont worry about rev share.
so in the middle, say you are expecting your flash to get like 20000 views, and the music is pretty good, well maybe 10-20% should be good.
If your flash is good, i'd keep your share at around 70-85%