Godspeed's "East Hastings" (I think) has a section like that, though it's more a matter of low volume than a nuance buried under louder sounds. About midway through the song, when everything seems dead quiet, you can just make out the band singing the melody line. I'm sure people who have heard this song know what I'm talking about and remember how cool it was when they discovered it for the first time, because it only adds harmonically when the instruments start joining in.
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