Michael Martin Murphey presents A Valentine's Cowboy Sweetheart Serenade on Thursday and Friday in the Valley Ballroom at the Carson Valley Inn. Tickets are $29, and are available at the Carson Valley Inn's hotel desk or by calling 783-6606. Murphey last appeared at the CVI when he played to a sold-out crowd in April of 2012.Murphey's successful music career has spanned four decades and has included such musical genres as folk, country, rock, Western, and cowboy music.He was inducted into the Texas Songwriters' Hall of Fame and the Texas Country Music Hall of Fame in 2009, as well as a …