Recording artist and prolific songwriter Phil Vassar has been collaborating with Grammy winner Rob Thomas, lead singer of pop group Matchbox 20. Thomas wrote and sang lead vocals on "Smooth," last year's comeback hit from veteran guitarist Carlos Santana. Vassar and Thomas are both signed to the same publisher, EMI Music. The two were introduced by EMI's Greg Hill in February 2000 when Thomas was in Nashville working on Matchbox 20's current album. So far, the pair has co-written a tune that may show up on Vassar's next album.