1. The lead vocals are doubled and they're very close except for the first verse, which is a bit loose. Producer/writer Tom Scholz is a noted stickler for detail so it seems to reason that they was left this way on purpose.
2. The background vocals are doubled and spread left and right so they stay out of the way of the lead vocals and cause a nice wide vocal soundstage.
3. In this video you can also hear the various layers of acoustic guitars, but what's interesting is that the vocal actually doubles the interludes after the choruses. This is pretty well buried in the final mix, but it adds to the sound.
4. Delp's vocal range is incredible, but what I found exceptionally cool is how long he holds the last note of the song at 2:55.
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