The sale includes individual tracks as well as track packs and full albums, all 50% off on Xbox 360, PlayStation 3 and Wii.
Harmonix has assembled a lengthy PDF with the complete listing and new prices.
All of the songs are immediately compatible with Rock Band 3 and - for the Xbox 360 and PlayStation 3 tracks - Rock Band Blitz.
The sale begins tomorrow (September 18) and will run for one week ending on September 25.
> Read our review of Rock Band Blitz
Watch a trailer for Rock Band Blitz below: