nope
No.
yes, the ps2 rock band controllers are actually ps3 controllers but they are ps2 compatible
yes
No, a Rock Band 3 microphone is not compatible with the first Rock Band game. Each game in the Rock Band series uses different hardware and software configurations, and the peripherals are designed specifically for their respective titles. Therefore, while the Rock Band 3 microphone works with Rock Band 3 and later games, it won't function with the original Rock Band.
No, which sux the big one!
The PlayStation wireless keypad and the Logitech PlayStation 3 Coreless media board Pro and I known you did not mean this kind of keyboard but the Rock Band 3 wireless keyboard for PlayStation 3
No, but you can use the Guitar Hero guitar in Rock Band. This is a link to a chart for a good idea of what guitar to get. http://www.gamespot.com/features/6183555/index.html
No, Rock Band 1 was released way before Guitar Hero World Tour so the drums aren't compatible. Also the guitar hero world tour drums have cymbals and the rock band doesn't. In the end: You can't back track.
O_o yes,yes they are compatible..have fun ;)
yes
no
Yes the songs are saved to your hard-drive, so are compatible with rock band 1 and 2.