The disc jockey who popularized rock and roll was

bill haley
elvis presley
alan freed
ed sullivan

Definitely was Mr. Alan Freed.

Explanation:

Mr. Alan Freed was considerate as one of the most important popularized the Rock and Roll during the 50s.

From popularizing the R&B records that did become the foundation of rock to planning the first rock and roll concert, he was the tireless promoter of the genre.

that is because lower interest rates allowed people to work harder to make money. it multiplied like that and now the uno(not the game) is very strong.

i like trains

it is a because im a fod nigba