Hi,
Soundfonts can be lots of fun to use, and a great way to get excellent sounds for free or inexpensively. We have a resource page on soundfonts at
http://www.notation.com/Articles-Soundfonts.htm There are a number of locations that host free/for fee soundfonts.
I also have a few harmonica soundfonts myself. If you can't find what you want, let me know via email and I can get you a couple.
ttfn,
Sherry