Here are some interesting websites I've found (usually
when I have to look someting up because I don't understand it). they
are in no particular order.
Buying Music Online
these are the best sites I've found - quick, easy and they deliver
on time!
Classical.com
A site where you can dowload music to your PC (at a small price)
or listen to snippets of music for free. It also has a great
reference section
ChoralNet
This is a huuuuge site with loads of information about repotoire,
technique, help with music and all sorts. One of it's greatest features
is its bulletin boards where you can pose questions to choir
members all round the world - if you don't know something then
somebody here will!
The Choral Domain Public Library (CPDL)
This is just a mammoth site for downloading music but it also has
a lot of really good resources. There are over 8000 pieces of
sheet music to download here and most of them come with midi
files attached. One of my first points of call when we have a
new concert to plan!