Original sentence: The performers at the festival in 2009 included 3 Daft Monkeys, Attila the Stockbroker, the Swanvesta Social Club,Rory McLeod , U2, Muse and Queen(Freddie Mercury sent his apologies)
Edited sentence: The performers at the festival in 2009 included 3 Daft Monkeys, Attila the Stockbroker, the Swanvesta Social Club, and Rory McLeod