The artists in smooth jazz whose success endures the longest are those who develop an identifying trademark in their style -- when you hear their song, you know it's them. A veteran of the genre at age 28, keyboardist Brian Culbertson has over the years made his particular imprint a very distinctive interaction with horns. On his latest, Nice & Slow, he's sometimes even the one playing them. On the throbbing, funky "Get It On," his high register piano musings take verses on their own.