I have some idea about the Canadian network or station this broadcast originated on but am not 100 % sure. The show is called Grapevine from October 1972. The host Doug Aldridge sounds like a broadcast professional. The format is progressive rock but highligting new or recent releases. The track played by Cream is older but it comes from a 1972 compilation.
Roxy music was not widely played at the time but you will hear them here. The set opens with a progressive staple called Deteriorate by National Lampoon . The host can be forgiven for calling Pure Prairie League a Canadian group as the album played was recorded in Toronto. The bassist mentioned as a member of the group was not but rather a studio hand. Clapton cohort Bobby Whitlock can be heard on a solo version of Tell The Truth.