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Rock Band 4 ships with 65 songs on the disc, spanning rock music and other genres from the 1960s to the 2010s. The release of Rock Band 4 was prompted by several factors, including the market penetration of the eighth generation consoles PlayStation 4 and Xbox One, a stronger internal vision for what Rock Band 4 should be within Harmonix, and continued support from fans of the series. Following the over-saturation of the rhythm game market in 2009, weak sales of Rock Band 3 led Harmonix to put the series on hiatus, though the company continued to provide downloadable content through 2013. The game was released in October 2015, following a five-year hiatus from the release of Rock Band 3. Rock Band 4 is the fourth main installment in the rhythm game series, Rock Band, developed by Harmonix.
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Rock Band 4 features tracks by the band U2, the first time songs from the group have been included in a rhythm game.
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