David Whitbeck wrote:

>Now for my question: On these two recordings that I have (Beethoven
>Piano Concertos Nos 3,5 Royal Edition Sony Classical Bernstein New York
>Philharmonic, Mozart Piano Concertos Nos 21,27 DG Abbado London Symphony
>Orchestra) with Serkin on the piano on both recordings; I occasionally
>here this odd sound.  Have you ever heard the weird moaning sound of
>wind when you're inside close to a window?  Well I hear something like
>it on these recordings: a moaning wind sound. Can anybody tell me what
>that sound is?

If the location was Kingsway Hall in London that would be the underground
trains of the Picadilly Line.

Tony Duggan, England.
Mahler CD recordings survey is at:
http://www.musicweb.uk.net/Mahler/index.html