I'm not sure what song sparks "the most" joy in me as it depends on the context. Belting out Morning Musume's "I, I, I, I surrender" ["I" in English sound the same as "ai" = "love" in Japanese] in the right company at a karaoke party (not that one indulges in such vanities in these dark times) can certainly spark joy...
But so can anything by The Who when that force of nature, Keith Moon, was still alive:
Hello @hirohurl I Surrender Rocks :0 great energy
And yes the Who is an staple.
I also used to like Uriah Heap , for some strange dark reason