I was surprised not to see CALYPSO here. According to wikipedeia, "Released as the B-side of "I'm Sorry", "Calypso" received substantial airplay, enabling it to chart on the Billboard Hot 100.[2] After "I'm Sorry" fell out of the #1 position, "Calypso" began receiving more airplay than "I'm Sorry," thus causing Billboard to list "Calypso" as the new A-side.[1] Hence, "Calypso" is itself considered a #2 hit on the Hot 100.[3]"
I can't find any information to back up this fact other than Wikipedia so for now I'm not going to add it, but if you you know which week it hit the charts or any other information I'll add it