Given how record labels want you pumping out music every other day this bug is easy to reproduce. I can confirm this. However it seems sometimes you do get paid for other tracks but it does not seem like the game properly follows and recognizes those tracks consistently (excluding the normal loss of value).
@ArchXDiablo
After thinking, I'm not sure if I received payment or not for these additional disks. This list was long and included not only payment for disks but for books and songs for guitar. I took it for granted that if there is no disk on the payment list, there is no money.
