is he part of a band or is he a solo performer?
Both.
Bill Bailey
He was part of punk band Beergut 100, which he founded in 1995 with comedy writer Jim Miller and also featured Martin Trenaman and Phil Whelans, with Kevin Eldon as lead singer. 
what is keynsham? It is a town and civil parish. in which country is it located? England. was there any evidence of romans living in historical times in that town? Yes, it may have been the site of the Roman settlement of Trajectus, was that town affected during world war ii? No. who is the topmost head governing that town? The town council. in which 'county' is the town located in? Somerset. name some religious places of worship in that town. St John the Baptist church, St Michael's, St Margaret's and St Francis' Church. name some notable people residing in that town. Bill Bailey, Neil Forrester, Mimi Thebo, Mark Regan and Luke Sutton. who is the first person mentioned above? He is an English comedian, musician and actor. which countries has he toured for his performance? Australia, New Zealand and the US. what did he perform in the first country mentioned above? UNANSWERABLE what musical instruments did he play? Piano and guitar.
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Bill Bailey [SEP] Music
Performed in the Colosseum in Watford on 24 February and in the Queen Elizabeth Hall on 26 February, the show contained orchestrally accompanied versions of many of Bailey's previously performed songs, an exploration of the instruments of the orchestra and a number of new pieces of music. The Queen Elizabeth Hall performance was broadcast on BBC Radio 3 on 16 March 2007 as a part of Comic Relief 2007.