Cyrus released a string of live performances known as the "Backyard Sessions" on YouTube during the spring and summer of 2012; the performances were of classic songs she personally liked. Having begun working on a failed fourth album the previous year, Cyrus resumed working on a new musical project in late 2012. She collaborated with producers Rock Mafia on their song "Morning Sun" (2012), which was made available for free download online. She had previously appeared in the music video for their debut single, "The Big Bang" (2010). Cyrus later provided guest vocals on "Decisions" (2012) by Borgore. Both Cyrus and Hemsworth appeared in the song's music video. She went on to guest star as Missi in two episodes of the CBS sitcom "Two and a Half Men". Cyrus attracted significant media attention after cutting her traditionally long, brown hair in favor of a blonde, pixie cut; she commented that she had "never felt more in [her whole life" and that "it really changed life".