Circular keyboards are relatively new concepts in music and computing.
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Circular keyboard instruments
The PianoArc is a circular wrap-around keyboard piano with 292 keys and a 6′ outer diameter. It was envisioned by Brockett Parsons, the keyboardist for Lady Gaga and first used in 2012. It was constructed by a friend for an estimated $120,000.
The Revo 1 Circular keyboard by Nu-Motion is a wireless round Digital & MIDI keyboard with a custom stand and ability to hold 5 songs 27,000 notes total making recorded songs sound live.
Circular computer keyboards
Circular computer keyboard arrangements are becoming available for both text entry and computer gaming applications, in both physical and touchscreen styles.
References
Circular keyboard Wikipedia(Text) CC BY-SA