As far as I can tell, Ghost Light is some breed of jam band from the same sort of pedigree that East Coast genius Marco Benevento has, albeit with more of a Grateful Dead nod. I say "as far as I can tell" because after checking out the website — which was full of many mellifluous adjectives involving the five-piece — I still had no idea what it sounded like. So I dug up a live recording of members Holly Bowling and Tom Hamilton performing a very modern take on The Dead's staple song Eyes of the World, which I found pleasing despite my prejudices. So if academy-level jamming par excellence is your thing, swing over to Humbrews tonight at 9 p.m. and watch Ghost Light's deal go down. Local guitar magician Piet Dalmolen opens ($15).