Last week, Apple and U2 teamed up to release the band’s newest album — Songs of Innocence — for free on iTunes. A new article from Time claims that the company and band are also teaming up on a “secret project” to boost digital music sales. According to the article, Bono “hopes that a new digital music format in the works will prove so irresistibly exciting to music fans that it will tempt them again into buying music — whole albums as well as individual tracks.” Details are very sparse, but it’s highly possible that this new project could involve a long-rumored higher-bitrate iTunes audio format, and/or the inclusion of iTunes Extras for albums, as Apple currently does with HD videos.