What about Abba - Dancing Queen
I think Knowing Me, Knowing You is a bit more catchy, but Dancing Queen is still (annoyingly) catchy.
"Knowing Me, Knowing You" is my favourite ABBA song! Such a cool guitar riff/melody in the middle and outro.
That one and "Does Your Mother Know".
The best Abba songs where never hits despite excellent videos recorded at the time for some reason.
Check out Eagle, The Piper, Head Over Heels, When I Kissed the Teacher, Under Attack, I´m a Marionette, Soldiers etc. All of them have evergreen potential and will propably grow in popularity as time goes by.
Even Happy New year and Thank You for the music were only a minor hits when released.