John Lenon sang with the Beatles?
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Depends on how you define “best.” Which Beatles single sold the most copies? Which Beatles single was on top of the charts for the longest period of time? Which Beatles songs are the most frequently covered? Which Beatles song is most discussed in music theory classes?

According to The Beatles' Top 50 biggest selling songs revealed, “She Loves You” is the top seller. That song was genuinely written by both John and Paul. Number two through five were “I Want to Hold Your Hand,” “Can’t Buy Me Love,” “I Feel Fine” and “Day Tripper”/“We Can Work It Out.” Of those five songs, “I Feel Fine” and “Day Tripper” were penned by John.

“I Feel Fine” is my favorite song by The Beatles, as are “You’re Going to Lose That Girl” and “She Said, She Said” (which was more of a John and George-penned song).

Here’s an article from Rolling Stone about the “best” Beatles songs. The Top Ten Beatles Songs of All Time

Within that article the songs “Yesterday” (written by Paul) and “Something” (George) are the most covered.

In so far as music theory discussions, the first song that comes to mind is “Not A Second Time,” a song written by John, has something called an “aeolian cadence”—the chord/notes John sings at the very end of the song. That’s the first time I remember a music teacher talking “theory” about any of their songs.

But most people would say John’s best song was “A Day In the Life” or “Come Together.” His most autobiographical songs were “Help” or “In My Life.”

That’s the great thing about The Beatles as a band, songwriters, singers or musicians in general. There’s something for everybody or anybody and there are no wrong answers, except perhaps for Revolution