THIS WEEK IN ROCK HISTORY
Events involving 1950s & '60s performers & their influences
  April 18, 1957 — Second Lieutenant Buddy Knox is called up for six months of active duty with the U.S. Army Reserves in his home state of Texas, during which his second hit, "Rock Your Little Baby To Sleep," is issued listing his military rank.

April 19, 1988 — Sonny Bono of Sonny & Cher is inaugurated as mayor of Palm Springs, California.

April 20, 1970 — The New York Times reports on "submarine churches" inspired by the Beatles' "Yellow Submarine." Their logos adapt the Christian fish symbol into variations of a submarine with the periscope forming a peace sign.

April 21, 1962 — Patti LaBelle & The Bluebelles appear on the Billboard Hot 100 chart with a song they hadn't recorded — "I Sold My Heart To The Junkman." It was actually taped by Chicago's Starlets ("Better Tell Him No"). While touring Philadelphia, they waxed the song at the request of a used car dealer who owned a studio on his lot. He issued the recording on his Newtown label, but gave singing credit to a local group led by Patricia Holt, who became Patti LaBelle when the group adopted the Bluebelles name. The Starlets sue the record company and win $5,000 each, but the disc rises to #15 pop / #13 R&B and the Blue-Bells become stars while the Chicago group soon breaks up.
                   1977 — Elvis Presley begins his final concert tour in Greensboro, North Carolina.

April 22, 1962 — Jerry Lee Lewis' first son, three-year-old Steve Allen (named after the TV host and good friend), drowns in the family pool.

April 23, 1954 — "Work With Me Annie" by the Royals is issued, beginning the era of the answer record. It becomes so popular (#1 R&B, #22 pop) that the group is renamed the Midnighters (eventually Hank Ballard & The Midnighters) to avoid confusion with the "5" Royales, who are under contract to the same record company.
                    1959 — After 24 years on radio and TV, the final Saturday night broadcast of the musical countdown show Your Hit Parade airs on NBC television. 
The final Top Five:
   #5 - "I Need Your Love Tonight" (Elvis Presley)
   #4 - "It's Just A Matter Of Time" (Brook Benton)
   #3 - "Never Be Anyone Else But You" (Ricky Nelson)
   #2 - "Pink Shoe Laces" (Dodie Stevens)
   #1 - "Come Softly To Me" (The Fleetwoods)
                    2012 — The Beach Boys begin their 50th anniversary tour, which reunites Brian Wilson with fellow founders Mike Love and Al Jardine along with longtime members Bruce Johnston and David Marks.  

---

Sources:

                     

Reference  (Eight Days A Week  Ron Smith)