Casper Leenaars releases music as Mosaic and began performing in the underground scene as a resident for PODD. He chose the name Mosaic after the Mosaic Session IPA, saying it also suited his approach of combining influences from different styles. In 2019, Mosaic released the single Misty (ft. Rick Payne) / Something Different on Dispatch LTD, followed by Weather the Storm / Cloud 9 on CODE Recordings. The 2020 single Love For The Game / A Good Life, made with Ben Soundscape, came out on Prestige Music Group. Ben Soundscape is also one half of The Insiders and runs Intrigue Music. In 2024, Mosaic released the single Product / Connected through ThirtyOne Recordings.
In 2026, Mosaic released the single Cold Shade EP on Intrigue Music and the single Celestial Dub EP on Dispatch LTD. Mosaic played The Croft on 27 February 2026, alongside Doc Scott, Ben Soundscape and Collette Warren. On 22 August, Mosaic played The Fox Cafe for an Intrigue event featuring RoyGreen & Protone, Ben Soundscape and Collette Warren.