Copyright Etiquette & Public Domain

[richard_wolpoe <richard_wolpoe...>]

Dear Ari,
        Your recent reply brings up something:
How can one research to find out waht Jewish music sis still copy righted 
and what is in public domain?

Also, re: Jewish Music that is copyrighted, what is the "proper" procedure 
in performing, or adapting that music?  Or in printing copies for choral 
use?  Are there any good guidelines on this?  Maybe an article or a book 
that is oritented specfically to Jewish Music.

Regards,
Rich Wolpoe