Circular keyboard
Circular keyboards are relatively new concepts in music.
The PianoArc is a circular wrap-around keyboard piano with 292 keys and a 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 and MIDI keyboard with a custom stand and ability to hold 5 songs and 27,000 notes total.
