1) 3 bands?
Bill Haley and the Comets
Buddy Holly and the Crickets
Cliff Richard and the Shadows
2. Year formed?
Bill Haley formed his band in 1949. They were originally called Bill Haley and the Saddlemen (played country western). They changed the name in 1952 From 1949 to 1952 they recorded under many names, including Johnny Clifton and his String Band and the Four Aces of Western Swing. In 1952 they changed to Bill Haley and the Comets
Buddy Holly and Bob Montgomery started singing together in 1952. By 1955, they had formed Buddy Holly and the Crickets.
Harry Webb formed a skittle band in 1957 . Then he sang for the Dick Teague Skittle Group. He changed his name in 1958 to Cliff Richard when his back up band was called the Drifters. His back up band reformed (new members) and the name was changed to the Shadows about 1958.
3) Which members play which instrument?
The original members for Bill Haley were: Johnny Grande on piano, Billy Williamson on steel guitar, Al Thompson on bass and of course Bill Haley. By the time they changed to the Comets, the group included Bill Haley, Grande, Williamson and Marshall Lytle (now on bass).
Buddy Holly and the Crickets. By the time the Crickets were formed the group was: Buddy Holly on guitar, Niki Sullivan on guitar, Joe Maudlin on bass and Jerry Allison on drums.
Cliff Richard and the Shadows. Cliff Richard sang. The back up band had Hank Marvin on guitar, Bruce Welch on guitar Tony Meehan on drums and Jet Harris on bass.
4. 4 hit songs?
Bill Haley and the Comets. Rocket 88, Rock the Joint, Rock Around the Clock and Shake Rattle and Roll.
Buddy Holly and the Crickets. That'll Be the Day, Peggy Sue, Maybe Baby,and Its So Easy.
Cliff Richard and the Shadows: Apache was the break through number for the back up band on its own followed by Kon Tiki. For Cliff Richard, Livin' Lovin' Doll and High Class Baby were two of his early hits.
All of the first 3 groups were American. Cliff Richard and the Shadows were English.
6. How many members.
You have the members in Question 3. The groups changed some members. One added a drummer because they did not originally have one.
Importance to film? To draw a young market. Rock appealed to teenagers so to draw teens to the movies, they used rock music in the films.
#1 Hits by Elvis. He had 18 No 1 hits in the US.
Older generations not like rock and roll? It was different from what they grew up listening to. Folks who grew up listening to swing music or pop (like Frank Sintra) would find rock and roll very different. Folks who grew up listening to Elvis found the Beatles and later acid rock very different. And so on. Each generation seemed to think the music of their youth was the best and later music was not as good.
The comments about sex being in rock music is not really accurate. The music of the 50s was quite tame. The 50s really was a pretty innocent era. Sexs, drugs and Rock N Roll did not come around until the late 60s.