An interesting web page demonstrates the harmonic series and applies it
to organ Mixture stops.  It's quite clear, the demos are short and there
is a delightful rendition of Charles Ives "America", an organ piece full
of humourous variations (bottom of page).  Almost on topic!  Visit
The Organ Builder:

    http://www.geocities.com/Vienna/Strasse/6809/orgbuild.html

Bill Chapman
AMICA Membership Secretary
Santa Rosa, CA