"Sh-Boom" is considered to have been the first rhythm-and-blues record to break into the top ten on the "Billboard" charts, reaching #5; a few months later, a white group from Canada, the Crew Cuts, released their cover of the song, which reached #1 and remained there for nine weeks.Soon, other R&B vocal groups entered the pop charts, particularly in 1955, which saw such cross-over doo-wop hits as "Sincerely" by The Moonglows, "Earth Angel" by The Penguins, The Cadillacs "Gloria", The Heartbeats "A Thousand Miles Away", Shep & the Limelites "Daddy's Home", The Flamingos "I Only Have Eyes for You", The Jive Five "My True Story".