Of music: of acknowledged excellence; of, relating to, or characteristic of a formal musical tradition, as distinguished from popular or folk music…

Theatre and Music. = legitimate, adj. 1d.

Designating or relating to art accorded superior status on the grounds of aesthetic merit or serious… Music regarded as serious, esp. as distinct…

Originally U.S. Music. Applied to a kind of jazz characterized by adherence to a score or set orchestration and a lack of improvisation, or to a…

slang (originally U.S.). Designating classical music, or other music considered sophisticated or refined, as opposed to popular music; of, relating…

Of literature, art, music, etc.: that deals with deep, grave, or profound matters; not intended simply to amuse, please, or entertain; requiring or…