I knew about the singing from the reviews of the Goblin MacBeth, because there’s musical improvisations in that live theatre piece.
Bruce Horak’s family seems to all be creatives.
I recall an interview from 2022 where he talked about being the youngest of 4 very competitive boys, with older brothers who are musicians. I believe his dad was a high school drama teacher(?), and an amateur cartoonist. Mum also in a creative field.
The painting / visual arts career is what caught me off guard actually. Horak said his dad encouraged him to make his own comics as a child to write stories. Here’s a piece on his one man show ‘Assassinating Thompson’