Quote Originally Posted by thanxal View Post
So, honestly it is difficult for me to tell the difference. Could you elaborate so I can re-listen for the difference?
It's the alto. In the quad version it's prominent and IMO flat. In the usual version the alto is either mixed in or absent. The harmony is not tight at all in the quad version. Listen to the quad version at about 1:18 and then listen to the other version at about the same mark. Can you tell the difference in the harmony?

Also on the chorus, on the quad version when they sing "into my life" [[and I'm going to try to describe this the only way I can via written word), the word "life" is sort of one note: "walked into my liiiife", whereas on the other version, when they sing "life" they sing "walked into my li-yfe" as maybe two notes, if that makes any sense.