Hans Hot 100 Beatles Songs: #98: ‘You Know My Name [Look Up The Number]’.
‘You Know My Name [Look Up The Number]’ – was the b-side to The Beatles #1 hit ‘Let It Be’ in early 1970. Easily one of their more obscure songs. It didn’t appear on an album until the Past Masters II album collection of non-album tracks appeared in the late 1980’s. Paul has been quoted at least once of saying that this was his favorite Beatles track. I think the main reason he would feel that way- this was late in The Beatles run- the John and Paul friendship at the time was very strained. John was with Yoko, Paul with Linda- The Beatles were starting to come apart at the seams when John and Paul got together and made this novelty tune in the spring of 1969. This was a throw back to the old times- they were having fun together. Brian Jones of The Rolling Stones- who would soon join the ’27 Club’- plays alto saxophone on this track. I think one of the reasons it makes my Hot 100 is- because it still sounds very fresh to me. The only times I’ve ever heard it on the radio- once back in the late 70’s when a local radio station had a Beatles A to Z weekend- and a few times in the past couple years on The Beatles Channel. It does sound like the boys were having fun making this record.
slicethelife 
To my ears this sounds more like an extended jam session/goofing off session that they just happened to record. Hey may have been what was needed then to defuse some of the tension?
That is what it was- they were having fun- which is why its one of Paul’s favorites- things had gotten too serious by this point between John and Paul- and this was a throw back to the old days- before it all came to an end.
Back in the day, I used to feel self-conscious about loving this ditty until I found out that plenty of other folks like it too.