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A rhythm was emphasised in the transformation of blues and R&B into rock and roll in late 1940s hits. It was a style in music that combined elements of jazz and blues to syncopated rhythms with a strong backbeat.
 African American developed it in the late 1940s incorporating horns incorporated to R&B., while the rhythm in blues is a swung eighth note.

In the late 1940s, the development of blues and R&B became rock and roll underlined the importance of rhythm.

What is backbeat?

The backbeat is defined as powerful percussive emphasis on the measure's so-called weak beats, usually played on the snare drum.

Backbeat is a four-beat measure with a continuous, strong rhythm that emphasizes the second and fourth beats.

The late 1940s hits stressed a sense of rhythm in the development of blues and R&B into rock and roll.

It was a musical style that fused jazz and blues elements with syncopated rhythms and a strong backbeat.

It was created by African Americans in the late 1940s, with horns added into R&B, and the beat in blues is a swung eighth note.

Therefore, there was the development in the rock and roll from the old R&B.

Learn more about the Backbeat, refer to:

https://brainly.com/question/9730392