Gill's new album, "These Days," spreads 43 fresh compositions across four genre-specific discs, with a span that includes country, rock, bluegrass, jazz and even soul.
"It just kind of unfolded," said Gill, who began the project in 2005 and has taken a 17-piece band on the road to promote it. "I had a real great creativity thing going on, a real great vibe, so I just kept experimenting and cutting songs.
"The beauty of this is that it wasn't intended to be this. This happened honestly. It just kind of unfolded."
"These Days" also features guest appearances by Gill's wife, Amy Grant, Sheryl Crow, Bonnie Raitt, Diana Krall, Phil Everly, Emmylou Harris, Lee Ann Womack, LeAnn Rimes, Gretchen Wilson, Trisha Yearwood and Michael McDonald.