I have tried for years to remember this movie. I knew it started when it an M. I happen to look at Glennis O'Connor's acting since I knew she had been in "Ode to Billie Jean" and there it was "Melanie". I am watching it right now on YouTube on my TV. It is not a real clear copy but great to finally have found it after over 40 years. Remember the male lead singing song over and over with lyrics "Real, real, real good and real, real, real......" with back up singers repeating "real, real, real..... I remember watching it a lot with my Dad over 40 years ago but could never remember the title except that it started with an M. The male I remember singing was Burton Cummings. I will never forget it again.
