6am Milestone: Led Zeppelin - Communication Breakdown
1968, Led Zeppelin (recording under the name of The Yardbirds) started recording their debut album at Olympic Studios, Barnes, London, England.
7am Milestone: Beatles - I want You (she's So heavy)
1969 John Lennon leaves The Beatles but agrees to not make an official announcement. The recording of "I Want You (She's So Heavy)"