By Kevin Amorim, Newsday, Melville, N.Y. Sep. 21--THURSDAY LAMBCHOP. Kurt Wagner is the Bob Pollard of Nashville, sort of. If Guided By Voices had more than 10 members at one time and dabbled in countryish rock. (8 p.m., Bowery Ballroom, 6 Delancey St., Manhattan, 212-533-2111.