Musical Instrument Jokes in the Yahoo! Directory

Canonical List of Banjo Jokes, The
Jokes at the expense of the banjo.
www.bluegrassbanjo.org/banjokes.html
Horn Jokes
www.thefrenchhorn.net/jokes.html
Hosaphone(tm) Headquarters
A description and primer about the low-cost valveless trumpet-like brass wind instrument called the Hosaphone(tm).
www.hosaphone.com
Instrument Jokes [mit.edu]
www.mit.edu/people/jcb/jokes