Official 
post (which disavows Roger Craig Smith)
Seriously why. Sonic and the Black Knight was the last one and it was also the last time you could beat the final boss to a kickaas buttrock theme song. Why don't we have this anymore?
I remember being hyped that Crush 40 would be in the third Sonic movie and then getting really disappointed it was only 5 seconds of Live and Learn. It should've played through the whole climax.