Yes it will work when it is the PS2 version game Band Hero featuring Taylor Swift by ACTIVISION
the ps2 kramer (GH3) and the guitar hero 1&2 guitars work for ps2 rock band games
Yes
Rock Band games on PS2 only support PS2-style guitars and PS2/3 Rock Band guitars and drum kits. Guitar Hero: Aerosmith and newer on PS2 support all instruments from all consoles that the games have note charts for (so no drums on GH:Aerosmith but 360 and PS3 drums work on all full-band GH games).
yes
yes
Assuming that your Guitar Hero guitar is a PlayStation 2 version and not Xbox or Wii, then yes it is compatible with Rock Band for PS2.
yes it will guitar hero controllers work on rock band
Yes
No, you can't use controllers between different consoles, but only with the same console. So you can use Guitar Hero PS2 controllers with Rock Band PS2, but not Wii.
If Guitar Hero World Tour is on PS2 then yes. If it is for a different game system then no.
Band Hero as of November 2009. (Wii,DS,PS3,PS2,X360)