CD and grammophone recordings of music

[Steen Ostergaard Olsen <soo@xxxxxxxxxx>]

Dear list.

I would be grateful to receive information about compression of  music when
recorded for CD's. Also I would like to know the compression ratios for long
playing grammophone recordings (33 rpm). Are there diferences between
recording of rock musica and classical music?

I would also be thankful to receive references to articles where I can read
about the differences of the amplitude and frequency pattern of popular music
and symphonic classical music.

Kind regards

Steen Olsen
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