HENRY’S RIFLE John Alfred’s one-man band hammers out raw Americana playing mostly banjo along with harmonica, guitar, heaps of foot-stompin’ and plenty roots-drenched howling. Alfred’s messy mix of blues, country, folk and hillbilly can be raucous or surprisingly sublime. Whether taking the banjo for a pleasant stroll or strumming it into a runaway train, the harp whistling along, this is backcountry music that’s at home anywhere Alfred hunkers down and straps on the strings. Also on the bill are Blackwater Redemption and the Slaughterhouse Chorus. $7-$9. The Milestone.