1956: Elvis Presley performed "Heartbreak Hotel", "Shake Rattle and Roll" and "Blue Suede Shoes" on The Milton Berle Show live from the USS Hancock in San Diego. Nielsen Ratings estimated that one out of four Americans tuned in.
1958: Bill Haley & the Comets began a month-long tour of South America, performing in Buenos Aires. (Note: many websites claim the tour began April 9. Haley and his group boarded a plane in Miami on April 2 and arrived in South American on April 3. According to the book 'Bill Haley' by Otto Fuchs, the Comets began their tour on April 3.)
1960: Elvis recorded "It's Now Or Never" and "Are You Lonesome Tonight?" at the RCA studios in Nashville, Tennessee for his upcoming album.
1960: The Everly Brothers made their U.K. concert debut at the New Victoria Theatre in London. The Crickets opened for the Brothers on the tour, a year-and-a-half after the death of Buddy Holly. (Note: many websites report that the tour began on April 6, but the correct date is April 3, as reported in the March 28th edition of 'Billboard' magazine.)
1961: Paul Anka starred on Make Room for Daddy on CBS-TV.