Another keyboard instrument used in the orchestra, as well as jazz, is the vibraphone.
en.wikipedia.org The vocal parts, however, only occur intermittently, and it is the keyboard instrument that accounts for the largest share of the music.
en.wikipedia.org The hydraulis was the world's first keyboard instrument and was, in fact, the predecessor of the modern church organ.
en.wikipedia.org The melodeon is another reed keyboard instrument, usually housed in a table-like casing, that predates the pump organ.
en.wikipedia.org The line up usually featured a rhythm section of drums, lead and bass guitars, a keyboard instrument, and a brass section of trumpet, saxophone and trombone.
en.wikipedia.org