Definition of john mayer:
(N) :
John Clayton Mayer (born October 16, 1977) is an American singer, songwriter, and guitarist.
(N) :
(born 1977) an American singer-songwriter and guitarist.
(N) :
John Henry Basil Mayer (28 October 1930 – 9 March 2004) was an Indian composer known primarily for his fusions of jazz with Indian music in the British-based group Indo-Jazz Fusions with the Jamaican-born saxophonist Joe Harriott.