in late 2012 and recorded from April to July 2013 their fourth album titled Fortress, which was released on September 30, 2013. The band reconvened in January 2016 and, through that July, recorded their fifth album The Last Hero, which was released on October 7, 2016. Walk the Sky was released on October 18, 2019. Having joined Alter Bridge primarily as lead vocalist, Kennedy began to play rhythm guitar during live performances following the release of One Day Remains. He has since played rhythm guitar on the band's subsequent studio releases, and also played lead tracks on a number of songs and during live performances. Solo career and collaborations Work with Led Zeppelin members: 2008–2009 Kennedy received a great amount of press coverage in late 2008, owing to a rumour that he was to join Led Zeppelin. After Zeppelin's one-off reunion in 2007, guitarist Jimmy Page and bassist John Paul Jones reportedly felt the band "still had something to offer." As reported by BBC News, Page and Jones were in the studio with Jason Bonham writing and recording material that was reportedly to be used for a new Zeppelin album. According to Bonham, singer Robert Plant was not involved. Page, Jones, and Bonham auditioned singers, fuelling rumours when they were reported to have attended an Alter Bridge concert. Twisted Sister frontman Dee Snider said that they were offering Kennedy the job to persuade Plant to reconsider. Alter Bridge guitarist Mark Tremonti said Kennedy "deserves" to play with Zeppelin. Kennedy remained mostly silent about the rumours until January 2009. "I am not singing in Led Zeppelin or any offshoot of Led Zeppelin," he said. "I did have a great opportunity and it was something that I'm very grateful for. But Alter Bridge will go on, and that's that." He later confirmed, however, that he had written and rehearsed with Page, Jones and Bonham. He also said that it was Bonham who "got the ball rolling", since the two had met on the set of the 2001 film Rock Star. "Working with them felt surreal," he recalled a decade later. "Jimmy played the Les Paul, and just being in the room with that guitar would have been enough for me. But standing next to him as he's playing those iconic riffs, the hairs on the back of my neck are standing up. We played 'No Quarter', 'Kashmir'… We did 'Carouselambra', which was