Proggish alt-metal elders Tool are back on the road, touring in support it seems of simply appeasing their rabidly loyal fanbase. A mainstay of mid-90s MTV, the rockers haven’t released an album since 2006, but no one in the audience of one of their notoriously trippy live shows seems to care. Catch them playing the hits this week with a two-nighter at Bill Graham Civic Auditorium.