Vince Gill just can't say no. With more than 26 million albums sold, the country icon can certainly afford to be spending his leisure time working on his precious golf game. Still, he frequently finds himself going into the studio to sing background vocals for his friends.

Vince's soothing voice has contributed to artists of practically every genre, including Eric Clapton, Brooks and Dunn, Carrie Underwood, Eddie Money, and Steve Martin. "I generally don't turn anything down if I'm available," he tells the Green Bay Press Gazette, "and that's because I did that for a living for a lot of years. That's how I fed my family and paid for a house. If not for being an artist and making records, I made my money by working on everyone else's records as a session player and a session singer ... It doesn't feel any different doing that now than it did then.''

However, one artist he surprisingly isn't eager to collaborate with is his wife, gospel and pop singer Amy Grant. "We got married 20 or 25 years into our careers. It didn't make any sense to say, 'OK, now we're married. We've got to be Steve & Edie or Sonny & Cher or Donny & Marie or whoever.' On occasion, we write some songs together. On occasion, we sing together ... We may make a duet record someday, but who knows. We feel like if there's one every now and then, that satisfies us.''