Max Carl Gronenthal (born January 29, 1950) is an American rock singer, keyboardist, guitarist and songwriter. He is the co-lead singer of the classic rock band Grand Funk Railroad. In addition, he spent several years as the keyboardist and lead singer for the southern rock band 38 Special. Carl is known for having co-written and sung lead vocals on 38 Special's hit song, "Second Chance" (1989).
Carl was born in 1950 in Platte Center, Nebraska, United States, and raised near the town of Humphrey, graduating from high school in Norfolk, Nebraska in 1968.
Throughout 1968–69, Carl played a significant role as a member of the Norfolk-based New Breed Blues Band,[better source needed] during which time he enhanced his interest in rhythm and blues music. Beginning as a saxophonist in this band, he later became the lead vocalist/keyboardist in the group. However, in 1969, he left the band to join the Lincoln-based Chancellors.

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