Sanft: Soft; gentle.
Serialism: A form of music writing based on Twelve-Tone technique, in which pitch classes, rythms, and often dynamics are determined systematically.
Second: The interval of two diatonic degrees.
Sequence: 1. Repetition of the same basic melodic theme at a different pitch. 2. A type of Gregorian chant with non-biblical texts, lines grouped in rhymed pairs, and one note per syllable.
Serenade: A love song, or piece traditionally performed below a loved one's window in the evening.
Seventh: The interval of seven diatonic degrees.
Sixth: The interval of six diatonic degrees.
Smorzando: An Italian dynamic indication: "fading away"
Sonata: A piece for a solo, or accompanied, instrument, usually in 3 or 4 movements.
Song Forms: The arrangement of sections in a song to contrast similiar and different sections. Often, letters are used to represent different parts of a given selection: ABA, AABA, ABACA, etc.
Soprano: The highest female vocal range, above alto.