Quoted from PanzerFreak:A few more songs could have gone a long way to making this game even better. Rag Doll and Train Kept Rollin would have been good upbeat songs for general modes and then Dream On for a super wizard mode.
It would be nice to see more songs added to the game but I doubt it will happen. It did for Metallica but the band itself seemed very into the game and even provided custom callouts. Maybe Stern got a break on licensing for the extra Metallica songs since the band was so involved. The same cannot be said for ACDC, KISS and Aerosmith.
How long after the Metallica release did they add additional music via a code update?
Aerosmith seems to license a lot of items so I wouldn't rule it out just yet.
The lack of different music for either wizard modes or just the final wizard mode seems odd. I'm hoping Stern can get this done.