First recorded (as “Do the Bop”) by Johnny Madara & the Juvenaires (1957).
Hit version by Danny & the Juniors (1958).
From the wiki: “Johnny Madara (aka Madora, aka Medora) had a minor 1957 hit (‘Be My Girl’) and Capitol Records was interested in a follow up. He had befriended a young vocal group called the Juvenaires and co-wrote for them ‘Do The Bop’ along with member Dave White. They recorded ‘Bop’ but Capitol passed on it.
“American Bandstand host Dick Clark heard the recording and suggested a change of lyric – substituting the outdated ‘bop’ with ‘hop’, to reflect the popularity at the time of record hops. White had the Juvenaires re-do the recording, with member Danny Rapp on lead vocal (and without Madara in the group, entirely), and acquire a new name – Danny & The Juniors – and the group scored their one and only #1 hit in 1958.”
Danny & the Juniors, “At the Hop” (1958):