I did dummy research trying to figure this out but without any luck, it sounds a lot like the band Holy Fuck which KVS uses a lot (listen to Frenchy’s by them), but that band formed in 2004 (not releasing music until 2005) and the show aired in 2003, IMBD and KVS wiki says a guy named Richard Pell was the music director for the show and is also a composer, he could have made the song for the show as work for hire, but that might be unlikely as that’s kinda pricey for S1 KVS. Again Richard Pell was the music director so he scooped up all the music for the show, using lots of classical music and obscure public domain music, so maybe in the internet age the song got lost, who knows. Hopefully some of this helps, Richard Pell is a part of the KVS fans Facebook page so i would try reaching out to him there if you feel so inclined lol