Descriptive Music: Program music.
Development: The elboration of melodic, thematic, or harmonic progressions in a piece.
Di: Of, with.
Diminished: Lowered, or reduced. Generally refers to the lowering of a pitch chromatically by one half step; ie., the term for an interval which has been decreased from the major by two half steps and from the perfect by one half step
Diminuition: The shortening of note values used in a theme to alter the melody without changing the pitches.
Dirge: A piece that is performed at a funeral or memorial service.
Dissonance: Notes that conflict, or sound outside of a chord in which they occur. Such notes usually fall outside of the overtones which are being generated by the note or chord that is sounding.
Divertimento: An entertaining instrumental piece made up of several short movements.
Dodecaphonic: Twelve-tone music.
Dorian Mode: A medieval mode whose scale pattern is that of playing D to D on the white keys of a piano.
Double Concerto: A concerto for two solo instruments, and orchestra.
Double Counterpoint: Invertible Counterpoint.
Double Flat: An accidental that lowers the note it preceeds by one whole step.
Double Sharp: An accidental that raises the note it preceeds by one whole step.
Dramatic Soprano: A female singer with a slightly lower range than a Lyric Soprano.
Dramatic Tenor: A male singer with a slightly lower range than a Lyric Tenor.
Dynamics: The degrees of loudness or softness in a musical work, and the symbols that represent them.