Kaiser Chiefs are an English indie rock band from Leeds who formed in 2000 as Parva, releasing one studio album, 22, in 2003, before renaming and establishing themselves in their current name that same year. Since their formation the band consists of lead vocalist Ricky Wilson, guitarist Andrew "Whitey" White, bassist Simon Rix, keyboardist and occasional drummer Nick "Peanut" Baines and since 2013 drummer Vijay Mistry, who replaced founding drummer Nick Hodgson who left the band in late 2012. Primarily inspired by new wave and punk rock music of the late 1970s and 1980s, the band have released six original studio albums: Employment (2005), Yours Truly, Angry Mob (2007), Off with Their Heads (2008)

Following a hiatus, Kaiser Chiefs announced that they expected to release their fourth studio album in mid-2011. The album was recorded over a period of eighteen months at various locations including drummer Nick Hodgson's self-built east-London studio. The album's producers included Tony Visconti, Ethan Johns and Owen Morris, in addition to Nick Hodgson himself. On 3 June 2011, Kaiser Chiefs launched their new album from their website. Using a create-your-own album technique, fans were able to choose 10 out of 20 songs to create "their album" for PS7.50; the band provides streams of roughly one minute to preview each track before selection. Many celebrities including, Radio One DJ Chris Moyles, The Guardian Newspaper, and frontman Ricky Wilson, created their own version of the album, donating the PS1 reimbursement for each copy sold to the Alzheimer's Society.  On 27 June 2011, Kaiser Chiefs released an official track listing for the album, featuring 12 of the 20 available tracks and including a previously unheard track 'Kinda Girl You Are' which did not make the initial launch as it was not ready in time. They played two sell out comeback gigs at Falmouth Princess Pavilion. Then followed by appearances at Germany's Hurricane and Southside Festivals in June, Switzerland's Gurten Festival, Pinkpop in The Netherlands, Belgium's Rock Werchter, Portuguese festival Optimus Alive! in July, V Festival in August, Hard Rock Calling in June, the Isle of Wight Festival in June and at Terres Rouges Festival in Luxembourg in September. They also played at Tennants Vital in Bangor, Northern Ireland and in September they played two sold out home town shows at Kirkstall Abbey in Leeds. They also be played in October in Festa das Latas, Coimbra - Portugal.  On 6 March 2012 the album was re-released under the title Start The Revolution Without Me for the US market. The track list differs significantly from the initial release, including the track "On The Run", which is exclusive to the US album and served as its lead single in early 2012.

Answer the following question by taking a quote from the article: How many songs were on the album?
fans were able to choose 10 out of 20 songs to create "their album"