Haggren Gravlund Malmö Two Swedish musicians and one Irish poet. Gustav Sigala Haggren and Peder Gravlund have put music to 14 of William Butler Yeats’ poems. It took them 17 years. The result is “Horseman, Pass By”. Haggren Gravlund’s tracks The Cold Heaven by Haggren Gravlund published on 2017-10-11T14:27:05Z The Wild Swans At Coole by Haggren Gravlund published on 2017-10-11T14:27:03Z Lady’s Second Song by Haggren Gravlund published on 2017-10-11T14:27:01Z