The Kalimba, also called Karimba, Thumb Piano, Lamellophone, Mbira, Sanza, among others, is a musical instrument from southern Africa. The keys are plucked with thumb or fingers, and the vibrations are amplified by a hollow box.

Tilt Theremin is a musical app for the Android platform. Using different sensors, it lets you play melodies in the air like the original Theremin.