Toby Keith will be having his gall bladder removed this week and has postponed a concert for Army troops at Fort McCoy in Sparta, Wis. Keith will now perform there on Aug. 30. Gretchen Wilson, James Otto and JT Hodges will substitute for Keith's scheduled set on Thursday (Aug. 2). Keith is expected to perform at WE Fest in Detroit Lakes, Minn., on Friday. As previously announced, Keith is expected to release a new album this fall. The lead single from that project is "I Like Girls Who Drink Beer."