Ditto! I thought for sure that it would be on the list!
Congratulations to the OP! You have possibly created the only list where I would rank the Beatles song last. GDS is always skipped when I play Revolver and is one of my least favorite Beatles songs ever. Even WoS is more listenable.
“Sunshine Day” by the Brady Kids.
Ok just kidding. “Ain’t No Sunshine When She’s Gone” by Bill Withers got my vote (although Adam Again does an excellent version), just beating out Stevie Wonder. “Let the Sunshine In” by the cast of Hair gets honorable mention.
Now, if you had listed the Eddie Grant song, Walking on Sunshine rather than the Katrina & the Waves song… It was a hit in the UK; don’t know about the US.
And then there’s Sunshine by Peter Hammill 
When opting to be sadistic, one must include a link to complete the torture…
I don’t know about his being a dick, but he sure has a heck of an ego. To hear him tell it, the three towering figures of music in the '60s were the Beatles, Dylan, and Donovan, not necessarily in that order.
I have a soft spot in my heart for “We’ll Sing in the Sunshine” by Gale Garnett, although I wouldn’t rate it #1.
Hey, I like that song! (though I still voted for Cream).
I’d like to add something, but all I can think of (that hasn’t yet been mentioned) is that “Sunshine, Lollipops, rainbows, buttercups” buble-gum song. I don’t even know who does it.
I’ll vote for Bill Whithers, it’s the best of the lot (even though, ironically enough, it’s the least “sunny” of the songs.)
Steal my Sunshine by Len
or
Let the Sun Shine In by Pebbles and Bam-Bam
I’m torn by which is a more annoying earworm.
Leslie Gore, from the movie Ski Party. It was a #13 hit in 1965.
Anal music freak nitpick: Lesley Gore!
I sit corrected.
try this youngsters, and reconsider
linkey
The first thing I thought of was Sunshine Superman but I’m old. I voted for Walking On Sunshine, as it’s more upbeat
Heh heh, I didn’t actually wait on anything. That was just my rather feeble attempt at parodying the lyrics of the song. It works a lot better if you make guitar noises as you read it.
OK, I voted for “Ain’t No Sunshine When She’s Gone,” but that’s technically soul, right? You said, rock or pop, so I came in meaning to vote for “Walking on Sunshine.”
But “Ain’t No Sunshine When She’s Gone” is a lot groovier.
“Sunshine of Your Love” is OK, and notable for being a Cream song that doesn’t simultaneously suck, blow, & bore me to tears.