the style of jazz regarded by the average player as today's norm, as opposed to fusion, rock, avant-garde, etc.; sometimes the term implies a somewhat conservative, relatively diatonic vocabulary exemplified by Oscar Peterson. Mainstream jazz is in a highly evolved state, having incorporated virtually the entire harmonic language of 20th century tonal music. In timbre, phrasing, form and rhythmic feel mainstream jazz still rests on a basis of bebop, which is why 'modern' jazz is considered to have started with bebop in the early 40s.
Originally a term that embraced certain music (particularly small bands) which extended the swing jazz tradition into the present; an umbrella term that includes all post-bebop acoustic jazz except that which is considered free or avant garde jazz; jazz reflecting hard bop sensibilities.
Mainstream is, generally, the common current of thought of the majority. It is a term most often applied in the arts (i.e., music, literature, and performance).
Mainstream is the first and only album of the UK Canterbury Scene band Quiet Sun. The band split up in 1972, Manzanera to Roxy Music, MacCormick to Matching Mole, Hayward to This Heat, and Jarrett began to teach mathematics.