Sos., Sost. Sostenuto. Sustained; prolonging the tone for the full duration of time indicated.
Spir. Spiritoso. In a spirited or lively manner.
Stave or Staff. The horizontal and parallel lines on which the notes are placed, used to indicate their relative position as regards pitch.
Trem. Tremolando. With trembling or wavering; a note or chord played with great rapidity so as to produce such an effect.
3o Trio.
Triplet. A group of three notes performed in the time of two.
T.S. Tasto solo. One key alone: a direction to play a part in unison.