PASK (Pianists for Alternatively Sized Keyboards) has produced three videos that summarise the case for keyboard choice: Part 1 is an overview of the issues, Part 2 describes the experiences and shows performance extracts of pianists who play smaller keyboards, and Part 3 is a summary of the statistics on hand spans, including gender and ethnic differences, and why hand span is important for piano playing. There are also versions with Japanese and Chinese text: https://www.youtube.com/playlist?list=PLHBn-VaaOCGe0Q5RFTjH05s5ASxVy-_la
The first pianist to ever play on an keyboard with narrower keys in a piano competition was Artem Arutyunyan in the Dallas International Piano Competition, held in Dallas, Texas in March 2014. Steinbuhler DS6.0® and DS5.5® keyboards are available as an option for contestants entering this competition. Artem chose the DS5.5® inch keyboard and adapted to this size after only a few days of practice! See a brief excerpt from his performance: https://www.youtube.com/watch?v=13Z7C3eJLeo&list=UUgLVf_Bv6l5tfa0E64DjOrw and also a video showing how quickly the keyboard can be being changed during a competition.
At the same competition in March 2015, Artem performed once again, this time on a DS6.0® keyboard. Another contestant, Anna Arazi, won third prize using a DS6.0® keyboard. She had never played this keyboard prior to the competition and adjusted completely after just one day of practice. The pain she had been experiencing previously in her arm completely disappeared. See this recording of Anna’s first round performance of Prokofiev’s Piano Concerto no 1: https://www.youtube.com/watch?v=tj1RNLn8K6g
For further information about the competition, visit: http://www.dcspianocompetition.org/
In particular, see the Playlist: ‘Alternatively Sized Keyboards in Action’.
Recordings and reviews
Dr Carol Leone’s CD: Change of Keys: One Piano, Three Keyboards, featuring works by Hayden, Beethoven, Chopin, Liszt, Debussy and Bartok, was released in 2016. Her CD won silver medals for outstanding achievement in both the Classical and Solo Instrumental categories in the Global Music Awards 2016.
For four excellent reviews, go to:- http://classicalmodernmusic.blogspot.com.au/2016/09/carol-leone-change-of-keys-one-piano.html?m=1, and http://transcentury.blogspot.com.au/2016/11/soloistic-thinking-and-rethinking.html, and http://theclassicalreviewer.blogspot.co.uk/2016/11/carol-leone-uses-three-donison.html?m=1, and download the review from the American Record Guide (Jan/Feb 2017) here: http://smallpianokeyboards.org/wp-content/uploads/2019/02/American-Record-Guide-Review.pdf
You can order the CD here:- http://www.msrcd.com/catalog/cd/MS1616.