Each program features solos and duets, and a finale with all four singers.

Schuur has been performing for 25 years, and has won two Grammy awards. Pop singer Adams' current album is All the Love. Allyson, who serves as the evening's host, has won critical acclaim for her albums, including her most recent, Wild for You. Gazarek's debut recording is due out this summer.

Tour dates are below:

February 4: Ridgefield Playhouse, Ridgefield, CT
February 5: Count Basie Theatre, Red Bank, NJ
February 11: Keswick Theatre, Glenside, PA
February 12: McCarter Theatre, Princeton, NJ
February 13: Community Theatre, Morristown NJ
February 16: Robert Ferst Center for the Arts, Atlanta, GA
March 10: Paramount Theatre, Seattle, WA
March 11: Cerritos Center for the Arts, Cerritos, CA