I'm not sure that an impromptu performance in a pub counts as a cover version, but last night I heard St James Infirmary played on "slap cello" and a sort of Chinese bamboo flute. More interestingly, but not a cover at all, the player of the Chinese flute had earlier performed on a sort of simple two-string Mongolian instrument apparently called dongola (or something similar) with throat singing in Mandarin.