His music career started in a band called "Pathos".
In 18 March 2014, a heavy metal band considered a supergroup with mostly Swedish members named Akani, was announced and formed by Antonsson himself on Co-Guitar, Jorge Merauder (Merauder, ex-Ill Niño) on Vocals, Anders Björler (At the Gates, ex-The Haunted) on Co-Guitar, Victor Brandt (Dominion, ex-Aeon, ex-Entombed, ex-Satyricon) on Bass guitar & Anders Lowgren (Dead Reprise) on Drums. On the same day, the band released a song titled "Who's to Blame?" from their upcoming four-song seven-inch single called "Santa Muerte", where the album art was released as well. Santa Muerte will be released in May 2014 through Demons Run Amok Records and the release was produced, recorded and mixed by the band themselves and with Martin Jacobsson at Rovljud Studios in Örebro.