0:03:07.635,0:03:10.100
(Johan Sebastian Bach - Goldberg Variations, BWV 988: i. Aria - Glenn Gould (1981)

0:03:10.131,0:03:13.260
(Horizontal Scale: logarithm of frequency (from 2 octaves below middle C to 3 octaves above it)

0:03:13.275,0:03:16.082
(Verical Sale: square root of mean intensity - A = 440 Hz (equal temperament assumed) )

0:03:16.082,0:03:18.112
( http://www.youtube.com/user/inwit )