1
00:03:07,635 --> 00:03:10,100
(Johan Sebastian Bach - Goldberg Variations, BWV 988: i. Aria - Glenn Gould (1981)

2
00:03:10,131 --> 00:03:13,260
(Horizontal Scale: logarithm of frequency (from 2 octaves below middle C to 3 octaves above it)

3
00:03:13,275 --> 00:03:16,082
(Verical Sale: square root of mean intensity - A = 440 Hz (equal temperament assumed) )

4
00:03:16,082 --> 00:03:18,112
( http://www.youtube.com/user/inwit )