[10] Riebl's childhood was surrounded by music: his uncle, Thomas, was a professor of viola at the Mozarteum Salzburg, and family members, including his cousin Misty who was an aspiring artist, studying at the Victorian College of the Arts would regularly take him to sit amongst the Vienna Philharmonic.

"[12]Riebl's younger brother, Max (1991–2022), sang and played trumpet on the song "Miserere" on The Cat Empire's second album Two Shoes.

[15] He was the primary songwriter on the band's self-titled debut album, including being the sole writer of their first single, "Hello".

In addition to his role as a musician in the band, Riebl helped produce the albums Two Shoes and Cities.

[17] In December 2015, Riebl released the four-track EP Lonely Truth, as a teaser for his second solo album.

[26] In July 2022, Riebl announced the forthcoming release of his third solo studio album, Everyday Amen, with the title track as its lead single.