Jamming with Acoustic Guitar

The January 2011 issue of Acoustic Guitar magazine (#217) includes an article on best procedures, good manners, and other ways of making the best for all parties out of a jam session, with (at least in parts) a specifically bluegrass frame of reference - though of course the basic rules work equally well for jams in all genres of music. It should still be possible to find this issue in the shops, though the February 2011 issue is now officially the current one: see the magazine's website.