/ Dictionary / Index M Mus.B.: Meaning and Definition of Find definitions for: Mus.B. Pronunciation: [key] Bachelor of Music. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Musaf* Musca Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language