In response to many:
-ljay--I do really enjoy this cast recording as well.
-I especially loved Stephen DeRosa as the Baker! I found him totally enduring. Ditto Kerry O'Malley--just love her upper register (where is SHE now?) The only cast member I didn't like was Jack's Mother...just. not. a. singer.
-"Giants in the Sky" is rather difficult, yes. Especially the last few phrases. I believe it goes up to an A.
-Adam's voice wasn't in the supremely-awkward adolescent phase, but it had not yet fully matured either. Plus it didn't seem like he'd done a lot (if any?) singing prior to ITW.
-The current consensus on Finishing the Chat is the song was cut at least once when they ran out of understudies/standbys. But others do recall hearing it might have been more than once.
...this bird is singing.