The greatest Pop song yet written and recorded.

Phil Spector’s vision was original. He was a producer, not an arranger/transcriber.  

He was also no dummy when it came to pop songs.  
“To Know Him Is To Love Him,” with it’s clever bridge chord progression/melody was written solely by Spector.  
He wrote one of my favorite songs ever, “Spanish Harlem” with lyricist Jerry Leiber.
Randy Newman played the “Jack Nitzsche role” on the brilliant Nitzsche-produced music for the soundtrack of the film Performance.  
In that same role as arranger, Randy Newman wrote the absolutely brilliant orchestral arrangement for Jerry Leiber/Mike Stoller’s masterpiece, “Is That All There Is?” with brilliant vocals by Peggy Lee.

The greatest pop song written and recorded ....  Lots of interesting opinions here - but I think the answer to this question was not even mentioned !  (Unless I missed it in this lengthy thread ! ).....

The greatest pop song one could argue is the song that has remained on the top 40 charts the longest - meaning it resonated with the largest group of music fans.  It is:   

"All I Want for Christmas Is You" by Mariah Carey.  It holds the record for the most weeks in the Top 40 history with 86 weeks.   86 weeks !!!   

FYI - she has also earned more than $50 million in royalties for this single song.  And no matter your age, religion, or musical taste, the song is a pop masterpiece.

My turn...

1  Imagine  John Lennon

2  No Regrets  Tom Rush

3  Triad  Jefferson Airplane (think David Crosby wrote it)

4  Don't Make Me Dream About You  Chris Isaak

They're all tied for first in my estimation

Whiter Shade of Pale—Procol Harem,,lyrics and that

                                      cadence

And Your Bird Can Sing—Beatles,,,my favorite Beatles song

I’ll think of more shortly.  Long list when other’s mention a good one  

@tylermunns: A songwriter/bandmate and I discovered Randy Newman’s first album through Van Dyke Parks and Brian Wilson. Because of Van’s work with Brian on the Smile recordings (I discovered the Smiley Smile album in early-’68, and turned him on to it. He became as obsessed with it as I), we got his debut album (Song Cycle, an amazing piece of work) as soon as we learned of it (it was released in late-’67). Listening to Song Cycle on acid is an experience unlike any other. 😉

Song Cycle opens with "Vine Street", a song credited on the album’s back cover to R. Newman (he is credited with the arrangement as well), and a little investigation revealed the R to be Randy. Van performs "Vine Street" in a somewhat surrealistic manner, so I didn’t know what to expect when I got Randy’s 1968 s/t debut album (it was released with two different covers; I of course have both 😉). The album credits production to Van Dyke Parks and Lenny Waronker, so getting it was a no-brainer. The album was engineered by Lee Herschberg, so it sounds great.

What a breathe of fresh air! In the midst of psychedelic horsesh*t, power trios (with which I was growing tired), and album side-long jams, here was an album of superb two and three minute long songs, recorded not with a Rock band, but an orchestra. Randy’s vocal abilities were obviously limited, but his delivery served the songs well enough. I became a life-long fan, though I wasn’t happy when he hired the members of Toto to record with him. I have his entire catalogue, Good Old Boys being a particular favorite. It was through Randy’s albums that I first became aware of Jim Keltner, Randy’s preferred drummer (he is also on Maria Muldaur’s 1973 solo debut, another favorite album of mine).