It may not have been the Happy Birthday song, but country stars came out to croon in honor of B-100's birthday.
Thousands of country music fans were also at the St. Joseph County Fairgrounds to celebrate and some fans even got in line early to stake out the best seats in the house.
The Drew Davis Band was the first act to take the stage.
One woman came all the way from Grand Rapids, Michigan to hear the band live for the first time since her wedding.
Neal McCoy, Jack Ingram and Danielle Peck were among the stars that also lit up the stage.