From CBC in 2015:
A living musical exhibit at the Montreal Museum of Fine Arts will set 70 zebra finches loose in an aviary, and the only perches are the strings of 14 electric guitars and bass guitars.
When the birds land, they create music that's played through amplifiers stationed around the aviary.
French artist Céleste Boursier-Mougenot calls it living music, inspired by a memory from his childhood.
"Looking through the window, my feeling was that I want to make music from these birds on the wire, and 30 years later I did this," he said.
Boursier-Mougenot also toured the living art exhibit around New York, Paris, London, and Milan. For the Canadian exhibition—shown above—he borrowed the birds from a local aviary; for the initial exhibition, he caught all the birds himself, then let them go ten days later.
70 birds play guitar in new art exhibit at Montreal Museum of Fine Arts [CBC News]