The ending of "A Day In The Life Of A Tree" has always been intriguing with VDP's spot and Brian closing the song in a lilting manner. Would be amazing if there was a Brian lead buried in the vaults.
One of the main reasons I would love a Surf's Up box set is for a bunch of vocals-only/backing-track/alternate-mix of this song. I read on here a while back that Brian cried in the booth when this part was being recorded. The amount of emotion going on in this tag is unreal; the progression from Reilly's voice to VDPs to that final wailing by Al ("oh lord I lay me down") - doesn't get much better than that.