I have always fancied the Orion "The Hunter" CD. A favorite track is the ballad titled "Joanne". As you listen to the verses, you will notice that lead vocalist Frand Cosmo will sing a line, which is then "answered" by a softer voice.....Brad Delp. At the conclusion of this track, Fran sings and "stretches out" the "Joanne" lyric whilst Mr. Delp sings the chorus lyrics in the background. I bloody LOVE this song!!!

Orion - "Joanne"

http://www.youtube.com/watch?v=7AqI5Ble7_o