Vince Gill is readying an unusual boxed set for fall release. While most such sets are career retrospectives, Gill's ambitious, four-CD package, "These Days," will feature only new material.

Vince Gill is readying an unusual boxed set for fall release, Billboard.com has learned. While most such sets are career retrospectives, Gill's ambitious, four-CD package, "These Days," will feature only new material. The set's 43 songs range from traditional country and bluegrass to jazz and rock, showcasing Gill's mastery of various musical styles.

The project is chock-full of guest musicians, including Sheryl Crow, Bonnie Raitt, Diana Krall, Rodney Crowell, Phil Everly, the Del McCoury Band, Emmylou Harris, John Anderson, Lee Ann Womack, LeAnn Rimes, Gretchen Wilson, Guy Clark, Trisha Yearwood, Bekka Bramlett, Michael McDonald and steel guitar player Buddy Emmons.

Gill's wife, Amy Grant, and his daughter, Jenny Gill, are also featured. The artist says he was not bound by deadlines or rules in creating this package, due Oct. 17 via MCA Nashville, and enjoyed the artistic freedom that it brought. He produced the set with Justin Niebank and keyboardist John Hobbs.

Gill’s last studio album, “Next Big Thing,” debuted in March 2003 at No. 14 on The Billboard 200 and has sold 286,000 copies in the United States, according to Nielsen SoundScan.