Are the Rock Band music store servers still online and functioning?

Rock Band 1, 2, 3 and the other spin-offs, their servers are now offline. Only Rock Band 4 servers are still running. You should still be able to download the songs from your download history on the Xbox 360. Just go to settings - account - download history. Scroll down to the song, select it, and start the download.

not all songs available in the rock band music store work in Lego Rock Band but it should say before you download the song what rock band game it works on so check the store again and see what game the song you want can be played on

Rock Band 3 has something for every genre of music, even Hip-Hop (ex. The Snoop Dogg track pack).

If I were you, I would buy Rock Band 3 as well as the first two Rock Band installments (Rock Band and Rock Band 2), so you can export the tracks from the first two installments. Don't worry about the cost. The first two cost roughly $10 together and $15
to export the songs ($5 [400 MSP] for Rock Band and $10 [800 MSP] for Rock Band 2). You might also consider looking into buying Green Day: Rock Band too.

If you're still skeptical, look online for the 83 default songs on Rock Band 3. Hope this helped.

Is this music you've downloaded from the Rock Band store or your own CDs? If it's your own CDs you can't.

Screw Rock Band. I don't really care for rock music.