Question

what genre of music derived out of rhythm and blues?
rap
rock n roll
ragtime
none of the above
question 2
the 1950s was the start of this music revolution.
jazz age
blues era
country
rock and roll

Explanation:

For the first question, rock n roll (rock and roll) has its roots in rhythm and blues. Rhythm and blues influenced the development of rock and roll with its musical elements. For the second question, the 1950s is widely recognized as the start of the Rock and Roll music revolution. Jazz Age was mainly in the 1920s, Blues Era has earlier origins, and country music has a different development trajectory compared to being a major revolution starting in the 1950s in the context of widespread cultural impact like rock and roll.

Answer:

1. rock n roll
2. Rock and Roll