Yeah, those tracks are great. I've got 3 Queen songs and 3 Marvin Gaye ones as well. A buddy of mine had a Doobie Brothers tracks that sounded AMAZING, but wouldn't give it up.
Some of those tracks are distorted as hell. A lot of it seems move excessive than the distortion of the final product. It's tough, these tracks probably slipped out because some intern ran into the vault, slapped the tape on the reel in the middle of the night, did a quick transfer to a DAW, packed it up and got the hell out. Anyone caught doing this transfer would get in a shit ton of trouble, so they were probably in a big hurry. The tape machine was likely not properly calibrated, or was calibrated for a different reference level of tape... Who knows!
In any case these tracks are a trip! It's really neat to see some of the raw sounds and clues you off to how they miced drums, guitars..and such. Things happen so differently now... Oh if I could travel in time...
-Marc