Callum performed with WRLDOFSONICS, a collective of top-tier musicians known for playing at various live events. He took part in multiple R&B showcases in Soho and Shoreditch, sharing the stage with a rotating lineup of four artists per night.

Each event involved a full-day rehearsal at Premises Studios, Hackney, ensuring tight arrangements before hitting the stage. The showcases were supported by ILUVLIVE, Arts Council England, and PRS Music Foundation, highlighting their significance in the UK live music scene.