A boy and a girl, by Eric Whitacre and Remember by Stephen Chatman, both SATB divisi. They pushed the boundaries of what we though choral music was, they are truly inspiring songs, for example Whitacre's a boy and a girl, the song sounds great but it is made up of mostly only +2's and Sus 4 with fifths in the TB parts, might sound boring but look it up on youtube it is sheer beauty