Basically, a way of analyzing music.

Specifically, music theory is made up of laws, rules, labels and other insights regarding Western music (particularly its harmonic tendencies), pioneered by a man named Rameau.

Music came first, theory came after.

Referring to women who are sexually or romantically attracted to other women. Applies to both lesbians and bisexual women, as it is only the same-sex attraction that matters, not any other attractions the women may have.

Originates from the Greek poet Sappho, a bisexual woman from the Isle of Lesbos, from which we get the term lesbian.

Essentially, the alphabet of music. It is important to learn theory so that when you decide to break the rules, you are doing it out of wisdom, and not out of ignorance. See: Miles Davis

1. The study of musical structure and aesthetics, concerning chord structures, musical intervals, rythms, meters, scales, etc.

2. Something that the majority of modern music artists lack knowlege of

A class that explains the structure of music. You'll learn the difference between an A-sharp and a B-flat. Later you get into the rules of writing counterpoints and four-part harmonies, which are useless unless you write classical music, but are still good to know.

The principles/guidlines of classical, real music. Modern musicians tend to neglect music theory or have little knowledge of it. However, most knowledgeable musicians have a basic idea of theory. (Steve Vai and Yngwie Malmsteen to cite two)

A set of rules, guidelines, and terminology that musicians have come to agree upon over time.

Music theory mostly deals with the earliest music ever written on paper to music written in the late 1800's.