Great idea. For the reasons stated but also that The Mudcat is probably the best place to do it and it will be a very valuable record of what music is played in all parts of the world.

The session, the informal gathering of people just to make music together, is the purest example of free cultural musical expression.

Not too sure if it would be wise to try too hard to seperate the genres or divide on which nation they are held. Record what comes in and just order it to make it readable.