Thursday and Friday: One of the more gifted singers and one of the most legendary songwriters in the country/folk music world are hitting the Music in the Zoo series on back-to-back nights. Harris' voice can still jar a corpse, to steal a Bob Dylan line. She also reminded critics that she's no slouch in the songwriting department on last year's album "Hard Bargain," which included touching tributes to her late friends Gram Parsons and Kate McGarrigle. Her opening act, Field Report, is a buzzing indie-folk act whose leader, Chris Porterfield, performed with Justin Vernon's pre-Bon Iver group DeYarmond Edison (7:30 p.m. Thu., $56.50). Prine lost much of his voice years ago, but he's still a major charmer in concert with as many memorable songs as one-liners, such as the greeting he gave last time he and his two bandmates performed with the zoo's pond behind them: "Welcome to the West Nile Virus Sanctuary." Willie Watson of Old Crow Medicine Show opens. (7:30 p.m. Fri. $65. Minnesota Zoo Amphitheater, 13000 Zoo Blvd., Apple Valley. 1-800-745-3000.)