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The african-origin kalimba/mbira is another instrument that is small and cheap and easy to retune, and hence another good candidate as a gateway to microtonal music. Retuning is apparently common practice among the traditional Mbira masters in Africa - see e.g. this article by Joe Monzo on the MakeMicroMusic yahoo forum.

Reference material on Mbira | Kalimbas used in microtonal music | Further development of kalimba-type instruments

Reference material on Mbira

Paul F. Berliner, The Soul of Mbira, University of Chicago Press, 1993.
L. E. McNeil, S. Mitran, Vibrational Frequencies and Tunings of the African Mbira, Journal of the Acoustical Society of America, 2008.

Kalimbas used in microtonal music

Several members of the Yahoo tuning forums have used kalimbas for microtonal music:

http://launch.groups.yahoo.com/group/tuning/message/78060 (Kalimba tuned to harmonic series, George D. Secor)
http://launch.groups.yahoo.com/group/tuning/message/78106 (Kalimba tuned to Mavila pentatonic, )

There are YouTube videos of microtonal kalimba music:
http://www.youtube.com/watch?v=VRnAHx-7Ef4 (Jacob Barton playing kalimba at the UnTwelve event on the 31.07.2008)
http://www.youtube.com/watch?v=RJd5DLtbtgk (Aaron Krister Johnson of UnTwelve playing his composition "Queen of Hearts")

Other microtonal kalimba/mbira references:
http://bp.b0b.com/2016/01/tuning-a-kalimba-to-bp/ (Tuning a kalimba to the Bohlen-Pierce scale)

A kalimba in Bohlen-Pierce tuning is also used in Just Her – Jester – Gesture and Burning Petrol, compositions by Georg Hajdu.

Further development of kalimba-type instruments

Kalimba-type instruments can also be developed further.

Kalimba with pitch bends

Array Mbira