The Beatles clearly dominated popular music during our junior year, at least after January 1st. They had four number one records and occupied the top spot for 16 weeks.
Louis Armstrong's "Hello Dolly" was in the top twenty for sixteen weeks.
"Hello Dolly" Top Twenty:

Rick Nelson was still on the charts in 1964 with "For You" which peaked at #15. His music had helped to soften rock and roll in the early 1960's.
One of the most successful groups to survive the "British Invasion" was The Beach Boys. They had four top ten records during our junior year, including their first number one, "I Get Around." Others were: "Surfer Girl" (#7), "Be True to Your School" (#6) and "Fun Fun Fun" (#5).
Jan & Dean also found success with the surf sound, scoring 4 top twenty records during our junior year: Honolulu Lulu #11; Drag City #10; Dead Man's Curve #8; The Little Old Lady (from Pasadena) #3
These are clips of the songs of our junior year -- not necessarily the best songs, but memorable songs - see how many you can name (some are quite easy).

We crossed the great divide of pop music in our junior year.  This was the year of the Beatles and the “British Invasion.”  The summer sounds of August flowed easily into September and October, and the tunes on the radio transitioned smoothly from the heartthrob crooner Bobby Vinton to the bouncy traditional rock of Jimmy Gilmer & The Fireballs.  Our taste for music was on cruise control.  We still had the “girl groups” with The Ronettes “Be My Baby” featuring Phil Specter’s “wall of sound.”  Dion was still around (“Donna, the Prima Donna”) and even Elvis Presley was still charting (“Bossa Nova Baby”).  It is a popular contention that this was a boring period for rock and roll and the nation’s teens were just sitting around waiting for The Beatles.  But that wasn’t exactly true.  As we moved into the winter of 1963, the juniors of the Class of ’65 had plenty of rock and roll.  The surf sound was still going strong (“Honolulu Lulu” by Jan & Dean) and what Arthur Conley would call “sweet soul music” was taking root with artists such as Garnett Mimms (“Cry Baby”) and The Impressions (“It’s Alright”).  And at the end of 1963 and into 1964, one of the great rock classics climbed the charts as the unpolished garage band, The Kingsmen gave us “Louie Louie.”  But when viewed from the other side, it is obvious that maybe something was missing as 1963 ended with songs such as Bobby Vinton’s “There I’ve Said It Again” and The Singing Nun’s “Dominique” on the top of the Billboard chart.

Then it happened.  It seemed so sudden.  But we’d heard of the Beatles for some time.  The television media had been covering the Beatlemania phenomenon going on in the UK. But the commentators had an air of bemusement – silly British girls screaming over four boys with “soup bowl” haircuts and music that “really wasn’t anything new.”  By early January we started hearing their music on the radio – Capitol records had released “I Want to Hold Your Hand”  in December and the album, “Meet the Beatles” in January.  In a way, it wasn’t “anything new” – it was classic rock and roll.  It was good rock and roll – a tight sound, played with energy.  But what put the whole thing over the top was the group’s appearance on Ed Sullivan on February 9th, 1964.  That was the divide.  It wasn’t just the sound, it was the visual.  With Ringo perched above and behind them, Paul and George positioned to the left, guitars in hand, often joining together at one microphone with John belting out his vocals (also, guitar in hand) from the right, the Beatles projected a buoyant spirit, a cocky, “here we are and we don’t care what you think” attitude that couldn’t help but appeal to a teenage audience.  A case can be made that by 1963, the early rock and roll that had appealed to the teenage rebel of 1956 had over the years been homogenized and made more acceptable to the adult population. Ricky Nelson sang rock and roll on “The Adventures of Ozzie and Harriet”  and parents concluded it wasn’t so bad.  Joey Dee and the Starliters played twist music in a New York club and adults started dancing.  Most of the rock and roll of 1963 (not withstanding “Louie Louie” and its rumored dirty lyrics), had an adult stamp of approval. The Bob Dylan music was a little unsettling, but he wasn’t quite main stream – just that quirky beatnik stuff.  But these Beatles were something different.  There was the hair.  And they were loud.  And even though they were kind of cute, they were, to use the British phrase, a little cheeky.  And as for the U.S. music labels, they were astounded – Decca had turned down the Beatles when they had auditioned in January of 1962.  No British act had been able to have any continued impact on the US charts – not even the best of the Brits, Cliff Richard.  Soon all the labels would be scrambling to sign anything “like the Beatles.”

The instant chart success of The Beatles was unparalleled.  On April 24th, 1964, The Beatles had the top five songs on the Billboard chart:  #1 - “Can’t Buy Me Love,” #2 – “Twist and Shout,” #3 – “She Loves You,” #4 – “I Want to Hold Your Hand,” and #5 – “Please Please Me.”  By spring, the demand The Beatles couldn’t fill was being met by other British imports such as The Dave Clark Five (“Glad All Over”), Gerry & The Pacemakers (“Don’t Let The Sun Catch You Crying”), and The Searchers (“Needles and Pins”).  Peter and Gordon would have a number one record in June with “A World Without Love” (written by Lennon & McCartney).  But don’t make the mistake of thinking that US artists disappeared.  The Four Seasons could still make it to the top of the charts (“Rag Doll” in July) and The Beach Boys had their first number one with “I Get Around” (also in July).  And of course, there was Motown:  “My Guy” by Mary Wells, “Heat Wave” by Martha & The Vandellas, and then The Supreme’s first number one, “Where Did Our Love Go.”   It wasn’t like American music lost all luster with the arrival of The Beatles.  Rather, it seemed that the energy in all the music got a big boost.  We got a big boost.  It took us out of a collective funk we had been in since the previous November.  As we emerged from our junior year, we were looking ahead, shouting it out … ”yeah, yeah, yeah.”
"My Boyfriend's Back" was a carryover from August. The first #1 song of our junior year was Bobby Vinton's "Blue Velvet."
#1 RECORDS of the Junior Year:

Title Artist week began #1 Weeks #1

My Boyfriend's Back by The Angels .... 8/31/1963 3 wks.
Blue Velvet by Bobby Vinton .... 9/21/1963 3 wks.
Sugar Shack by Jimmy Gilmer & The Fireballs .. 10/12/1963 5 wks.
Deep Purple by Nino Tempo & April Stevens .. 11/16/1963 1 wks.
I'm Leaving It Up To You by Dale & Grace .... 11/23/1963 2 wks.
Dominique by The Singing Nun .... 12/7/1963 4 wks.
There I've Said It Again by Bobby Vinton .... 1/4/1964 4 wks.
I Want to Hold Your Hand by The Beatles .... 2/1/1964 7 wks.
She Loves You by The Beatles .... 3/21/1964 2 wks.
Can't Buy Me Love by The Beatles .... 4/4/1964 5 wks.
Hello Dolly by Louis Armstrong .... 5/9/1964 1 wks.
My Guy by Mary Wells .... 5/16/1964 2 wks.
Chapel of Love by The Dixie Cups .... 6/6/1964 3 wks.
A World Without Love by Peter & Gordon .... 6/27/1964 1 wks.
I Get Around by The Beach Boys .... 7/4/1964 2 wks.
Rag Doll by The Four Seasons .... 7/18/1964 2 wks.
A Hard Day's Night by The Beatles .... 8/1/1964 2 wks.
Everybody Loves Somebody by Dean Martin .... 8/15/1964 1 wks.
Where Did Our Love Go by The Supremes .... 8/22/1964 2 wks.
The Supremes had their first #1 with "Where Did Our Love Go" in the summer of '64 -- we had no idea of the string of hits that would follow.
The Beatles appearance on Ed Sullivan on February 9th, 1964 took us across the great divide of popular music.
The Dave Clark Five would have three top ten records between March and August of 1964: "Glad All Over" (#6), "Bits and Pieces" (#4), "Can't You See That She's Mine" (#4). "Do You Love Me" (#11) came close and "Because" which was released in August would make #3 in September.
Peter (Asher) & Gordon (Waller) had five top twenty hits in the U.S. in 1964 and 1965.