Conductor Year Daniel Janin 1978 Dany Willem 1988 David MacKay 1972 1973 David Sprinfield 1981 Del Newman 1980 Dick Bakker 1996 1997 1998 Dieter Reith 1983 Dieter Zimmermann 1971 Dolf van der Linden 1957 1958 1958 1958 1958 1958 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1970 1970 1971 Don Airey 1997