The answer is probably "In a number of studios" but my real interest is in the two UK hit singles, "DoobeDood'nDoobe, DoobeDood'nDoobe, DoobeDood'nDoo" and "I'm Still Waiting".

"I'm Still Waiting" is a favourite of my wife's and "DoobeDood'nDoobe, DoobeDood'nDoobe, DoobeDood'nDoo" is a favourite of mine, with the latter being so generous in terms of the number of melodies in it and also in terms of having such an interesting string arrangement, with cellos playing a counter-melody under Diana Ross' vocals during each verse. Almost a musical overload.

To my ears both tracks also have a very distinctive non-Motown sound, neither Detroit nor LA, sounding a bit as though the've been bounced down several generations and suffered from misaligned tape heads.

So, does anyone know where they were recorded, where they were mixed and who engineered and played on them?