The file turned out to be a studio recording of "Don't Dream It's Over" with Neil singing, but a very sparse version. Neil's singing suggests it is somewhat recent (within the last few years). It is mostly acoustic guitar and brushed drumkit, and the famous organ solo is played on treated electric guitar.
Anyone know what this is? The maddening thing is, the file I found ends at about 2:05, so I don't even have the whole thing. I'm desperate to find what it is and where I can find the whole thing!! Anyone know anything about this?