 Complete the following phrase:  In 1950 Blackman was appointed music director at Regina Central Collegiate Institute, later becoming supervisor of music for the Regina high schools in 1961. In 19541955 he conducted the Saskatchewan Golden Jubilee Chorus and in 1959 his musical, Prairie Pastel for which his wife Elisabeth Blackman wrote the libretto, was presented for the Regina schools 50th anniversary. In 1962 he founded the Regina Inter-Collegiate Choir and Orchestra, ensembles with which he notably led performances at 