On this day May 9 in Rock history:

1964   After fourteen weeks at number one, The Beatles are finally pushed out of Billboard's top spot by 63-year-old Louis Armstrong's "Hello Dolly". When the song topped the Hot 100, Stachmo set a record for the oldest artist to ever have a number one song.

With his current US hit, "Nadine (Is It You?)" still on the charts back home, Chuck Berry makes his UK stage debut at the Astoria Theatre in Finsbury Park. His twenty-one city tour would feature a variety of opening acts, including Carl Perkins and The Animals.

1965 -   All four members of The Beatles attended Bob Dylan’s acoustic concert at London's Royal Albert Hall during his UK tour. They watched from a box, later visiting Dylan at the Savoy Hotel with singer Alma Cogan and poet Allen Ginsberg. It was a pivotal moment bridging American folk-rock and the British Invasion scene.

1969 -   George Harrison releases his second album, "Electronic Sound" on the short-lived Zapple label, a division of Apple Corps. Ltd. The LP is made up of experimental work comprised of two lengthy pieces performed on a Moog 3-series synthesizer. The effort was heavily criticized as unfocused, unstructured, and consisting of random sounds, and failed to enter the record charts on either side of the Atlantic.

1970 -   The Guess Who hit the top spot on Billboard's Hot 100 with "American Woman". The song was born by accident when guitarist Randy Bachman was playing a heavy riff on stage after he had broken a string and the band had taken a break. The other members joined in on the jam and Burton Cummings started singing the first thing that came into his head. A fan in the audience had it all on tape and presented it to the group after the show. It was quickly developed into a full song in the studio and ended up spending three weeks at the top of the Billboard Hot 100 chart. It made #19 in the UK.

1973 -   Mick Jagger adds $150,000 of his own money to the $350,000 raised by The Rolling Stones' January benefit concert for victims of the Nicaraguan earthquake.

1974 -   Bruce Springsteen And The E Street Band opened for Bonnie Raitt at the Harvard Square Theatre. Music critic Jon Landau was in the audience that night and in his review he wrote, "I saw rock and roll's future and its name is Bruce Springsteen."