Here’s a fun parlor game for the next time you’re out at a local show: Six Degrees of BOBfest, where everyone in Spokane’s current music scene is either an alum or somehow connected to the annual high school battle of the bands. It probably only takes three degrees, really. Now in its 17th year, BOBfest is the place where high school bands from around the region compete and — maybe more important — prove themselves as musicians. This year, the top three bands get to play a show at the Bartlett, among other prizes and recording studio time for the winner.