Only packs that are designated for use with Beatles Rock Band can be used in that game. These are track packs of Beatles songs. It is the same with Green Day Rock Band, only Green Day track packs can be used with that game.
Yes
With any of the Guitar Hero Series Game No. Without Rock Band Game Disc No. You need Rock band Disc then you can download them
You probally can't
Hey, Rock Band's been out for a while now and Rock Band 2 is coming out soon, you can find a place to order Rock Band for Wii online for the cheapest price in the Related Links below.
Gamestop
The General Store
To get 500 songs on rock band 2 you have to download many aditional songs or use rock band track packs, which songs cost 160 Microsoft points each and the trackpacks can be from $20 to $40. Also rock band 2 includes 20 free songs to download if you get the promotional code on the back of the instruction manual. All of these require an xbox live or playstation network account.
Yes the songs are saved to your hard-drive, so are compatible with rock band 1 and 2.
No, but Harmonix the makers of Rock Band are releasing packs of the most popular songs downloaded and released it as a Rock Band Track Pack Vol 1. It sells for $30 for 20 songs. Check it out at Gamestop, thought it won't be released till supposedly July 15, 2008. http://www.gamestop.com/Catalog/ProductDetails.aspx?product_id=71402
Yes!
There are several Rock Band games. Rock Band 1, Rock Band 2, Rock Band Track Pack Vol. 1, 2, Classic Rock, and AC/DC. And on September 9th, Rock Band: The Beatles will be out, (and I already reserved a copy, which you can pretty much do at any game store).