In the opera house he was regarded as a particularly fine interpreter of Mozart and Wagner , conducting the complete Ring des Nibelungen with Scottish Opera in 1971 .
He was also a constant advocate of new music by Scottish composers .
In the opera house advocate was regarded as a particularly fine interpreter of Mozart and Wagner , conducting the complete Ring des Nibelungen with Scottish Opera in 1971 .
He was also a constant advocate of new music by Scottish composers .