Wild Mountain Thyme (also known as Purple Heather and Will Ye Go, Lassie, Go?) is an Irish/Scottish folk song. The lyrics and melody are a variant of the song "The Braes of Balquhither" by Scottish poet Robert Tannahill (1774–1810) and Scottish composer Robert Archibald Smith (1780–1829), but were adapted by Belfast musician Francis McPeake (1885–1971) into "Wild Mountain Thyme" and first recorded by his family in the 1950s.

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