question: What do both Andy Partridge and John Mayer do in their bands as well as writing songs and singing?
answer: guitarist
context: Title: John Mayer
  Passage: John Clayton Mayer ( ; born October 16, 1977) is an American singer-songwriter, guitarist, and producer.  He was born in Bridgeport, Connecticut, and raised in nearby Fairfield.  He attended Berklee College of Music in Boston, but disenrolled and moved to Atlanta in 1997 with Clay Cook.  Together, they formed a short-lived two-man band called Lo-Fi Masters.  After their split, Mayer continued to play local clubs—refining his skills and gaining a following.  After his appearance at the 2001 South by Southwest Festival, he was signed to Aware Records, and then Columbia Records, which released his first EP, "Inside Wants Out".  His following two full-length albums—"Room for Squares" (2001) and "Heavier Things" (2003)—did well commercially, achieving multi-platinum status.  In 2003, he won the Grammy Award for Best Male Pop Vocal Performance for the single "Your Body Is a Wonderland".
  Title: Take Away / The Lure of Salvage
  Passage: Take Away and The Lure of Salvage are two sides of a single LP containing dub versions of XTC tracks released under the moniker Mr. Partridge, a pseudonym for Andy Partridge.  It was released on February 29, 1980 on Virgin Records.
  Title: John Mayer 2008 Summer Tour
  Passage: The John Mayer 2008 Summer Tour is a concert tour by musician John Mayer to support his third album, "Continuum".  The tour has been heavily covered by tabloids due to Mayer's relationship with Jennifer Aniston.
  Title: Clay Cook
  Passage: Douglas "Clay" Cook (born April 20, 1978) is an American songwriter, producer and musician who co-wrote several songs with John Mayer including "No Such Thing", "Comfortable", "Man on the Side" and "Neon".  Cook and Mayer's songwriting partnership was predominantly through Mayer's early career, as the songs he wrote with Mayer (with the exception of live releases) only appear on Mayer's first two releases, "Inside Wants Out" and "Room for Squares".  Cook and Mayer formed the band Lo-Fi Masters prior to Mayer recording "Inside Wants Out".  Cook is currently a member of the Zac Brown Band and was formerly a member of the Marshall Tucker Band and Y-O-U.
  Title: Andy Partridge
  Passage: Andrew John Partridge (born 11 November 1953) is an English singer, songwriter, guitarist, and record producer who co-founded the rock band XTC.  He lives in Swindon, Wiltshire, where he was raised.
  Title: Who Says (John Mayer song)
  Passage: "Who Says" is the thirteenth single released by American singer-songwriter John Mayer, and the first to be released from his fourth studio album, "Battle Studies".  It is Mayer's first studio recorded single release since "Say" in 2007.  On September 25, 2009, "Who Says" was released on John Mayer's official website.
citations: John Mayer Andy Partridge