http://library.thinkquest.org/3588/Renaissance/Town/Music/Crumhorn.html Description of the instrument with audio samples. http://members.iinet.net.au/~nickl/crumhorn.html Information about the crumhorn, including listings of makers, sound files, bibliography and links. http://www.earlymusicinschools.org.uk/general/prod_4.htm Article about this 15th century instrument of the windcap family, with pictures and sound files. http://members.aol.com/cornetto45/art/crum2.htm Applying microwave design techniques to renaissance woodwind musical instruments, by Charlie Jackson.