You missed a good one though, "Dear Prudence" was written in May 1968, "The sun is up, the sky is blue, it's beautiful and so are you".
Then there's "Silent Spring" Radiohead
"The Opening Act Of Spring" Frank Turner (my son the recording engineer loves his stuff)
"Spring Sprang Spring" from Seven Brides for Seven Brothers.
Hey, you probably can do a whole 'nother spring theme show or two from that massive collection.