* Major: A musical scale or key that has a whole tone between the third and fourth notes.
* Mezzo: A term used to describe a voice or instrument that is between soprano and alto, or between tenor and bass.
* Meter: The regular pattern of beats in music.
* Middle: The middle section of a musical piece.
* Minor: A musical scale or key that has a half tone between the third and fourth notes.
* Moderato: A tempo marking indicating a moderate speed.
* Molto: A term used to mean "much" or "very".
* Movement: A section of a larger musical work, such as a sonata or symphony.