Roger Carmody - who some may remember as the guy in the gas mask working to restore mold-damaged recordings of Brad Delp, has posted a recording from 1982 on SoundCloud. The song, Voice of the Man Who Loves You, was recorded as part of the "So Long Sessions" and features Brad on vocals.
Listen to the song on SoundCloud
Update August 30: Roger has released another track on SoundCloud featuring Brad, this one is called So Long. Listen to the song.