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

s
- Sample clearance
- Sampler
- Scale
- Scale degree
- Scansion
- Score
- Scriabin’s mystic chord
- Second / 2nd
- Secondary dominant
- Secondary leading tone chord
- Second inversion
- Sectional ternary
- Sectional variations
- Secundal chord
- Segmentation
- Semitone
- Sequence
- Sequencer
- Sequential modulation
- Serial music
- Seventh / 7th
- Seventh chord
- Sforzando
- Sibilance
- Similar motion
- Simple meter
- Simple ternary
- Simultaneity
- Sinfonia
- Sixth / 6th
- Slur
- Solfege
- Sonata
- Sonata da camera
- Sonata da chiesa
- Sonata form
- Sonata rondo
- Species counterpoint
- Sprechstimme
- Staccato
- Staff
- Standard
- Storyboard
- Stretto
- Strike
- Strophic
- Stylus
- Subdominant
- Subject
- Submediant
- Subset
- Subtonic
- Subtractive synthesis
- Subwoofer
- Suite
- Supertonic
- Suspension
- Sweeten
- Synchronization
- Syncopation
- Syncopation