Pentachord

In pitch-class set theory, a pentachord is defined as any five pitch classes, regarded as an unordered collection (Roeder 2001).

In other contexts, a pentachord may be any consecutive five-note section of a diatonic scale (Latham 2002).

The name "pentachord" was also given to a musical instrument, now in disuse, built to the specifications of Sir Edward Walpole.

It was demonstrated by Karl Friedrich Abel at his first public concert in London, on 5 April 1759, when it was described as "newly invented" (Knape, Charters, and McVeigh 2001).

3, the cellist/composer James Cervetto praised the pentachord, declaring: "I know not a more fit Instrument to Accompany the Voice" (Charters 1973, 1224).