What do both Andy Partridge and John Mayer do in their bands as well as writing songs and singing?
Andy Partridge: Andrew John Partridge (born 11 November 1953) is an English singer, songwriter, guitarist, and record producer who co-founded the rock band XTC. John Mayer: John Clayton Mayer ( ; born October 16, 1977) is an American singer-songwriter, guitarist, and producer.
guitarist