(AP) - The Oak Ridge Boys have been harmonizing for 40 years. And to help celebrate four decades in the music business the quartet will be kicking off "The Oak Ridge Boys 40th Anniversary Tour" early next year.

The group also plans to release a commemorative album and a network television special is also in the works.

The first concert of the U.S. and Canadian tour will be held January 19 at the historic Opera House in Galveston, Texas.