As Tupac was a credited producer for each of these songs, it's technically "his music." But that is obviously an argument of semantics. Many would agree that it's only his words and lyrics. Nothing else.
What bothers me the most is that the two things being praised here are the Music and the Story, and unfortunately, you can't understand half the songs due to staging/lyrics, and the story is boring and empty.
"The keep saying Tupac's "music", but it's not his music, is it?"
I'm very happy to see one other person actually notices this distinction - nobody else seems to care the slightest bit.
CurtainPullDowner, Whizzer (in another thread) acknowledged that the actual composers get credit in tiny print at the back of the Playbill.
However, I strongly suspect that Daryl Waters (listed as orchestrator, arranger, and musical supervisor) deserves a lot more attention and acknowledgement for creating material than he's receiving. But, since this is essentially a vanity production, canonizing Shakur, no one is particularly willing to let the creative spotlight get shared.