The Kyrie from Mozart's Great Mass in C minor, K427, played by the Chor und Symphonieorchester des Bayerischen Rundfunks conducted by Leonard Bernstein. The solo is sung by the American soprano Arleen Auger, who died in 1993 of brain cancer at the age 53. Bernstein died in 1990 so this must have been performed sometime in the 1980's.
Addendum: Actually it is from 1990 so it must have been right before Bernstein died.
Here is the whole mass if you have an hour.
