The correct answer is cameras
The two television shows that helped introduce America to new rock ‘n’ roll artists by frequently presenting live performances are <u>Dorsey Brothers' Stage Show</u> and The Ed Sullivan Show.
Both TV shows had the likes of Elvis Presley present and performing their Rock n Roll music on the show live.
Dorsey Brothers' Stage Show was 1-hour show that aired on CBS
Stage Show was hosted by Tommy and Jimmy Dorsey and produced by Jackie Gleason.
On the other hand, The Ed Sullivan Show was hosted by entertainment columnist Ed Sullivan. It also aired on CBS television.
Both TV shows promoted Rock n Roll during the period of 1950s to 1960s.
Hence, in this case, it is concluded that the correct answer is <u>Dorsey Brothers' Stage Show and The Ed Sullivan Show</u>.
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