Johnny Dark was a radio force on WCAO during the coming of the age of rock 'n' roll, perhaps hitting his peak when he served as master of ceremonies for the Beatles' 1964 appearance at the Baltimore Civic Center.
For a generation of fans, he was the usher who brought them to rock's front row.
"Before he put a record on, you couldn't wait to hear it. He brought incredible excitement to the music," said singer Ronnie Dove, a pop and country recording artist Mr. Dark introduced to Baltimore audiences in 1964.
"He was my friend and my mentor in the music business for more than 50 years," said Mr. Dove. "I loved him."
Mr. Dark, a...