Small studio upright acoustical pianos with only 65 keys have been manufactured for end by roving pianists. Acknowledged as "gig" pianos and still containing a cast Grand Piano Covers iron harp, these are comparatively lightweight and can be easily transported to and from engagements by only two men. As their harp is longer than that of a spinet or console piano, they have a stronger bass solid that to some pianists is well worth the trade-off in distance that a reduced key-set offers.
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The extra keys are added primarily for increased resonance from the associated strings; that is, they vibrate sympathetically with other strings whenever the damper pedal is depressed and thus give a fuller tone
- Only a very small chiffre of works composed for piano actually good these notes
- Greater recently, the Stuart and Sons clan has also manufactured extended-range pianos
- On their instruments, the dimensions is extended both down the bass to F0 and up the treble to F8 for a full eight octaves
- The extra keys are the same as the other keys in appearance.