Percussion family - Instruments made of sonorous material that produce sounds of definite or indefinite pitch when shaken or struck, including drums, rattles, bells, gongs, and xylophones.

Pianissimo - Very soft.

Pianississimo - Very, very soft; the softest common dynamic marking.

Piano - Soft. Pianoforte.

Pianoforte - "Soft-loud." A keyboard instrument, the full name for the piano, on which sound is produced by hammers striking strings when keys are pressed. It has 88 keys.