Don't wanna start a new topic, so I'll post here [it kinda fits, anyway!
I guess everything I thought I knew WAS wrong! See.. I was playing around with several tracks in Cool Edit Pro [an audio mixing software], and when chosing the remove-vocals feature, I listened to EYKIW.. and got a surprise during the bridge. When the accordion normally plays, you can clearly hear "Do" on every beat. Before, it seemed like some random instrument, but.. Yeah. And at the sax part, there's a deep voice [I'm pretty sure they're all synthetic voices, but then again..] going "la la la" to the same melody as the sax and guitar. Quiiiiiite clearly. And yet, I barely noticed it at all the first time I heard it. Maybe it's just me, but.. I dunno, it just stood out so much. Yeah, I get excited easily
edit: you can listen to the modified version here