Harmonix has said it will continue to release songs from the back catalog of downloadable content each week for Wii until all songs are available, and starting in March 2009, is making new DLC available for Wii at the same time as Xbox 360 and PlayStation 3. The Wii version of Rock Band did not support downloadable content however, Rock Band 2 and Rock Band 3 do, with DLC first made available in January 2009. Also, certain pre- Rock Band 3 songs deemed 'suitable for all ages' by Harmonix are also available for use in Lego Rock Band. All downloadable songs released prior to October 26, 2010, are cross-compatible among Rock Band, Rock Band 2, Rock Band 3, Rock Band Blitz, and Rock Band 4, while content released between October 26, 2010, and October 5, 2015, is compatible with the latter three titles only, and all content released on or after October 6, 2015, is only compatible with Rock Band 4. Most downloadable songs are playable within every game mode, including the Band World Tour career mode. For example, the album Blood Sugar Sex Magik is available for download it contains the song 'Give it Away' on Rock Band 2 and Blitz, so the downloadable album does not include 'Give it Away'. Since on-disc songs are not available for download, some albums are incomplete. Tracks released for Rock Band 2 on the Wii platform are only available as singles while Rock Band 3 offers multi-song packs as well as singles. Players 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, usually at a discounted rate. From March 2010 until September 2014, authoring groups could submit their own tracks for peer review through the Rock Band Network. Harmonix typically provides three to six new tracks per week available to all consoles as listed below. The Rock Band series of music video games supports downloadable songs for the Xbox 360, Xbox One, PlayStation 3, PlayStation 4 and Wii versions through the consoles' respective online services.

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