One act for which I'd like to get some input from the house is The Alan Parsons Project.
My understanding is that The Alan Parsons Project is a lot like Steely Dan in make-up and execution: there are just two members (Alan Parsons & Eric Woolfson = Steely Dan's Donald Fagen & Walter Becker) and EVERYONE else is a session player. And then a lot of APP's session players returned to work on multiple albums.
Their Wiki article generally backs this up:
The Alan Parsons Project was a British rock band active between 1975 and 1990 whose core membership consisted of producer, audio engineer, musician and composer Alan Parsons and singer, songwriter and pianist Eric Woolfson. They were accompanied by varying session musicians and some relatively consistent session players such as guitarist Ian Bairnson, arranger Andrew Powell, bassist and vocalist David Paton, drummer Stuart Elliott, and vocalists Lenny Zakatek and Chris Rainbow.
All the session players on that list are British-born-&-bred except Lenny Zakatek. Zakatek was born a British subject in what is now Karachi, Pakistan. He moved to the UK as a child. I understand that by the ground rules of this exercise, recordings with Zakatek are ineligible.
Speaking of recordings: something else complicating the eligibility of APP songs is that the band isn't readily defined by what's in the album's liner notes. Their albums' players are simply listed as "Personnel" with no distinction between Parson/Woolfson and the session players.
So, anyway ... what does the house think? Tracks without Zakatek are OK? Or are such tracks still disallowed if Zakatek is on any other track on the same album? In short -- does Zakatek's role as a session vocalist on one song make all the rest of the album ineligible? Or is Zakatek properly considered a session vocalist (Parsons used many), and so doesn't affect the act's eligibility at all?