OK, more traditional folk: This angelically-harmonized folk ballad was featured in Simon and Garfunkel's '64 debut album "Wednesday Morning, 3 A.M.". Based upon "The Bonnie Lass o'Fyvie", an old Scottish folk song from the 1600's. A captain of the Irish dragoons falls in love with a beautiful Scottish girl who does not return his affection. Narrated in third person by one of his soldiers. The title "evolved" into "Fennario" over the years and was adapted to the War of 1812 and the American Civil War. Dylan recorded it for his first album in '62 and Joan Baez performed it in '63 as "Fennario". Sung also by The Chad Mitchell Trio, The Journeymen and The Grateful Dead.
Yesterday's answer: "Full Moon And Empty Arms". In my book the Piano Concerto No.2 is one of the most beautiful pieces of music ever written.