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The average female handspan is between seven and eight inches,2 which makes the standard forty-eight-inch keyboard something of a challenge. Octaves on a standard keyboard are 7.4 inches wide, and one study found that this keyboard disadvantages 87% of adult female pianists.3 Meanwhile, a 2015 study which compared the handspan of 473 adult pianists to their ‘level of acclaim’ found that all twelve of the pianists considered to be of international renown had spans of 8.8 inches or above.
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Invisible Women: Data Bias in a World Designed for Men
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Alkan even wrote a piece for four feet, called Bombardo-Carillon, in which the player’s legs are likely to get entangled during performance. (When Swiss-American pianist Rudolph Ganz was asked to perform Bombardo-Carillon with a female pianist, he declined on the grounds that he didn’t know her well enough.)
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Stuart Isacoff (A Natural History of the Piano: The Instrument, the Music, the Musicians--from Mozart to Modern Jazz and Everything in Between)