The country group Diamond Rio got more than just a guest appearance on the Grand Ole Opry. They also got a surprise invitation to join the cast and quickly accepted.

Bob Whittaker, Opry president and general manager, offered them a regular spot during their guest spot Saturday night on the 72-year-old country show.On behalf of the group, lead singer Marty Roe accepted, saying, "It's a dream that has gone through generations of my family and all theirs."

The six-member Diamond Rio is the reigning Country Music Association group of the year. Their hits include "Meet in the Middle" and "Imagine That."