Topics range from species counterpoint through post-tonal and beyond. See also the Dictionary of Digital Media.

t
- Tacet
- Tactus
- Tag
- Tails out
- Talkback
- Tape manipulation
- Tape recorder
- Tempo
- Ternary form
- Tertian harmony
- Tessitura
- Texture
- Third / 3rd
- Thorough bass
- Tie
- Timbre
- Time signature
- Toccata
- Tonal
- Tonality
- Tone row
- Tonic
- Transpose
- Transpositionally equivalent
- Treble clef
- Triad
- Trio sonata
- Triple counterpoint
- Triplet
- Tritone
- Tritone relationship
- Tutti
- Twelve-tone music