Disc jockey Alan Freed uses the term rock and roll to describe R&B, in an effort to introduce the music to a broader white audience.
The release of "Rocket 88", a song by Jackie Brenston and the Delta Cats. Some music historians consider this record to be the first rock and roll recording.
... \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) of the field whose square equals b2 - 4ac". In some fields, ...