He frequently toured the USA and Canada 1959-1977 with other Scottish entertainers such as Helen McArthur, often appearing in small local venues. McKellar made the majority of his recordings on the Decca Records label. He also recorded several classical works, including Handel's Messiah alongside Joan Sutherland in a performance conducted by Sir Adrian Boult.
McKellar also recorded the musical Kismet with Robert Merrill. He was also notable for his recordings of Gaelic songs in translation such as the Songs of the Hebrides arrangements by Marjory Kennedy-Fraser.
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