Get your groove on at this popular Northside music venue.. In Short This mega-nightclub is decorated with autographed instruments and photographs from well-known musicians who've played on one of the club's two renowned stages. Three separate bars and a lively dance floor round out the space. The diverse, sophisticated crowd is well-dressed and older (over 30). Near capacity crowds every Thursday through Saturday, confirm that ARJ's is considered Milwaukee's top spot for live jazz, blues and R&B.