Jam bands are a both a genre and a very viable excuse to do acid. It all starts out when a group of angry forty-something men who both remember the seventies and also remember how much they sucked at life during the seventies get together with their dead parent's instruments and decide to ' rock out'. the whole 'effort' thing gets old fast, as it turns out, pot is much easier to do than memorize music, so, the whole memorizing thing kind of went to hell after 15 minutes. As it [also] turns out, it doesn't really matter that much if the music is just rambling shit static coming out of instruments when you've just spent the last two hours in a room with seven other idiots and more LSD than st. patrics day at jimmi henrix's house. so, they decided not to remember anything. and thus, jam bands