Bach’s Aria of the Goldberg variations, 6 times slower.
Last scene of Mizumono
Of course this isn’t as good as what Reitzell did, but it’s the closest I can give you. I used Glenn Gould’s version of 1955 and slowed it with paulstretch in audacity, which slows the track but conserves the pitch. (And I cut it at about 5 minutes otherwise it would have been too long.)