As well as being an actor and fencer, Felix is a talented musician. As he explained to Entertainment Weekly in February 2021, music has always been a part of his life. "My dad played guitar and he still plays guitar so he was always singing and playing for me when I was growing up," he explained. "I picked up a guitar when I was about seven or eight, I think, and I've just been trying my hardest since then. I also started playing piano when I was about 10, and then picked up the drums with my band when I was about 12 or 13, and singing sort of came along with that."
Felix was even the guitarist and singer in a punk rock band called Enemies Alike with three of his friends in Melbourne. Throughout high school, he played several local gigs with his band members, and since then, he's been able to show off his music chops in Happy Together and Zoey's Extraordinary Playlist. He also shares plenty of videos of himself singing and playing guitar on Instagram.