Sufjan Stevens Sample

[Shriness]

Hi all, I recently heard a song by Sufjan Stevens from his album 'Illinoise'; track 3 called 'Come On Feel the Illinoise'. When it hits the second act at about 4 minutes in, I think there's a sample in there - it sounds awfully familiar - but I can't pick it for the life of me.

I can't conciously recall having heard this album or this song before, but it sounds so familiar like something I've heard many times before. I could be wrong but if anyone has any insight or if the kind of three-step melody thing followed by flute rings bells for you I'd love help with this one, it's gonna drive me nuts until I figure it out! Thanks!