Links:
Not yet organized ---
Invented musical instruments from found materials -- fun site showing what can be done with some imagination and recycled materials: http://www.angelfire.com/folk/inventedinstruments/
A resource page for ABC music notation: http://www.gre.ac.uk/~c.walshaw/abc/#introduction
Program for converting ABC to banjo tab: http://www.theconceptory.com/banjo/extremetab/abc%20project/abcdefg.html#
On-line source for small quantities in metals: http://www.onlinemetals.com/
And (the one I've used): http://www.metalexpress.net/
Banjo Resource.com, Ritchie Dotson site: http://www.banjoresource.com/