26 songs.
It depends if the Guitar Hero 3 songs were released as DLC on GH: World Tour. There is no way to directly import songs from Guitar Hero 3 onto World Tour.
I don't think you can.
Only in Multiplayer.
NO
no
NO
Guitar Hero World tour "Beat It"
You need to import them
86
Yes, there are downloadable songs for guitar hero world tour.
no.. not at this time
no you can not ONLY in guitar hero WORLD TOUR.