Circle Guitar’s semi-automation frees your hand to interact with the instrument in new ways, such as muting strings to create unusual timbres, or devising new chord shapes that use two hands.

Jesse Colin Young, who sang one of the signature songs of the 1960s counterculture, the Youngbloods’ “Get Together,” before ...

But perhaps the most eye-catching innovation of the entire show was the Circle Guitar – a new innovation developed by Circle Instruments, which has been described as “a hyperinstrument that ...