This section is in violation of MOS:ALLCAPS and needs editing for compliance with Wikipedia's Manual of Style. Downloadable content from previous Rock Band titles (excepting The Beatles: Rock Band) is forward-compatible in Rock Band 4 within the same system family (Xbox 360 downloads are usable in the Xbox One version and PlayStation 3 downloads are usable in the PlayStation 4 version) at no additional cost. In addition, due to changes in the charting format and gameplay of Rock Band 4, the released songs no longer support keyboard or Pro guitar and bass (future downloadable content will continue to support vocal harmonies and Pro drum charts), and most songs no longer display 'family friendly' or 'supervision recommended' ratings. Starting from October 6, 2015, all music added to the downloadable content catalog is exclusive to Rock Band 4. Dates listed are the initial release of songs on PlayStation Network and Xbox Live.

All songs available in packs are also available as individual song downloads on the same date, unless otherwise noted. The following table lists the available songs for the Rock Band series released in 2021.

Rock Band 4 was unveiled in March 2015, and released on October 6, 2015. All songs that are available to Rock Band 3 are playable in Rock Band Blitz. Users can download songs on a track-by-track basis, with many of the tracks also offered as part of a 'song pack' or complete album at a discounted rate. The Rock Band series of music video games supports downloadable songs for the Xbox One and PlayStation 4 versions through the consoles' respective online services.

Rock band for playstation download free