In the context of sex, suck and blow are almost the same thing. So since that’s where the derogatory terms originated from, that’s why they mean almost the same thing in slang, too.
Ok, after much pointless discussion. The Greatest Pop Song Ever Written is “I Don’t Know What It Is” by Rufus Wainwright
Please excuse me Sir, but this whole discussion is pointless because opinions of music are so very subjective.
A song associated to a very special memory in your mind making the song even lovable. Maybe a successful date with a very special lady, maybe a long adventurous trip somewhere, or maybe something entirely different making the song so very special for you, you and nobody else.