S
Saxophone
Woodwind instrument with single reed and keys. Invented by Adolphe Sax
Schnell (Ger)
Quickly
Segno
Sign
Semibreve
Two minims, four crotchets
Semiquaver
Half a quaver
Sempre
Always. Used with other terms, e.g. sempre staccato
Semplice
Simple
Senza sord
Without mute
Septet
A piece for seven performers
Sforzando
Heavy accent
Sharp
A symbol which raises the pitch of a note one semitone
Simile
The same
Sixteenth note (US)
A semiquaver

Slur
A curved line placed above or below two or more notes of different pitch indicating a legato style
So
The fifth note in sol fa
Sol fa
A system of note-names and hand signs used in the sight reading and learning of music. The scale degrees are do re mi fa so la and ti
Sonata
1 - A composition of several movements, usually for piano or solo instrument and piano
2 - A musical form
Soprano
Female higher voice range
Soprano clef
Another name for the G clef
Sourdine (Fre)
Mute
Staccato
Detached sounds, indicated by a dot over or under a note. The opposite of legato
Staff or stave
Five perpendicular horizontal lines upon which music is written
String family
Instruments with strings that produce sound when plucked, bowed, or struck, including violin, viola, violoncello, double bass, harp and guitars
Subito
Suddenly
Symphony
Large scale work of several movements, usually for orchestra
Syncopation
Accent on an unexpected beat