The Australian musician had set himself a challenge for his 30th birthday. He wanted to go skydiving, wearing nothing except a harness, and play a couple of violin pieces on the way down.
Armed with a A$50 (£30; $40) instrument, a bow and not much else, Mr Donnelly completed his feat in a tandem jump in New South Wales on Sunday.
He played Happy Birthday during the freefall - a little celebration for himself.
When the parachute opened, and he began to float, the violinist drew the opening strains of The Lark Ascending by English composer Ralph Vaughan Williams.