Really nice. Listening to all the versions, I think the quartet version sounds a bit too "thick", and not as personal as the first two version. It's also more obviously synthetic.

I've got the same reaction to the piano RealTracks as Kevin does. They're lovely sounding, but the transitions can be a bit jarring. I think it's more obvious on the piano than other instruments - even the guitar - because of the multiple strings. The ringing tones of the prior phrase cut, and there's a "thump" at the start of the phrase, perhaps from the pedaling. Since it happens on the beat, it's easy to cover with other instruments.

In any event, it's an excellent song and a great vocal performance - plus, a great mix that's clean and balanced. It's a real joy to listen to.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?