No. Rock Band is made by Harmonix and Band Hero is made by Red Octane, the same company that makes Guitar Hero.
You can't
Unfortuately there is no downloadable content for the PlayStation 2 version of Rock Band.
Yes, rock band unplugged is out, you can find the demo on the playstation store
No. The only way to download songs for Rock Band is through the Rock Band store.
Off the playstation network, using a computer, PSP, or PS3
No and it is a total rip-off 3 songs for 5.99
Rock Band 2 doesn't start out with the same songs as the first game, but you can purchase some of the songs from the first game in the store, as well as new songs.
You can download songs from the marketplace, or directly from the Rock Band main menu, where it says "Music store".
buy them in the store on the game
when you first turn it on and you're on the playstation 3 system go all the way to the right and go the the playstation store. (must be connected to internet) then you must select game add ons. let that load quick, and select the game rock band. now you can go through and select songs to buy. note: must have credit card
you go to the store and buy them on the wii version, you get to the store by making a band
Easy. Play mystery setlists or buy songs in the music store.