Gamespot scored some choice details regarding the downloadable content for the upcoming Rock Band - details like price and release dates. Details you'll find in a blockquote right here:

Rock Band will still feature preselected three-song packs for download, but they will instead cost $5.49 (440 Microsoft points on Xbox 360). Songs will also be available individually for $1.99. Harmonix has said future songs will be sold individually for as little as $.99 (80 Microsoft points), and as much as $2.99 (240 points). However, "the vast majority" will come in at the standard $1.99 price point.

Week of November 20, 2007: (*-asterisk denotes a cover version)
Metallica Pack
"Ride the Lightning"-Metallica
"Blackened"-Metallica
"And Justice for All"-Metallica

The Police Pack
"Can't Stand Losing You"-The Police
"Synchronicity II"-The Police
"Roxanne"-The Police

Queens of the Stone Age Pack
"3's and 7's"-Queens of the Stone Age
"Little Sister"-Queens of the Stone Age
"Sick Sick Sick"-Queens of the Stone Age

Individual Tracks
"Fortunate Son" as made famous by Creedence Clearwater Revival *
"Juke Box Hero" as made famous by Foreigner *
"Bang a Gong (Get It On)" as made famous by T-Rex *
"My Sharona" as made famous by The Knack *
"Cherry Bomb" as made famous by The Runaways *
"Joker & The Thief"-Wolfmother

Week of November 27, 2007
David Bowie Pack
"Moonage Daydream"-David Bowie
"Heroes" as made famous by David Bowie *
"Queen Bitch" as made famous by David Bowie *

Week of December 4, 2007
black sabbath Pack
"N.I.B." as made famous by Black Sabbath *
"Sweet Leaf" as made famous by Black Sabbath *
"War Pigs" as made famous by Black Sabbath *

Week of December 11, 2007
Punk Pack:
"Rockaway Beach"-Ramones
"I Fought the Law"-The Clash
"Ever Fallen In Love" as made famous by Buzzcocks *

Week of December 18, 2007
Individual Tracks
"My Iron Lung"-Radiohead
"Buddy Holly"-Weezer
"Brass in Pocket" as made famous by The Pretenders *

I guess two bucks isn't that bad for a single track. Three bucks is pushing it. Mostly I'm just happy to see that some of those upcoming tracks look like songs I'd actually be interested in buying.