William James Graham Muir was a Scottish painter and musician, best known for his work as the percussionist in King Crimson from 1972 to 1973, appearing prominently on their fifth album Larks' Tongues in Aspic. Following his departure from King Crimson, Muir returned to Scotland, where he pursued a monastic Buddhist lifestyle at Samye Ling Monastery. He returned to music in 1980, later contributing percussion to studio albums from Derek Bailey, Evan Parker, and Michael Giles, the latter of whom was a founding member of King Crimson. By 1990, Muir had permanently retired from music and focused his efforts on painting.