It's always hard to review a movie like this. I mean, when you have a dramatic talk between a Nun and the "wild" kid who is trying to explain youth culture to her, explaining the 60's Mexican slang... Libertad Lamarque is the morally upright but profoundly understanding nun who wants a broken family to get together again. Cesar Costa is a young man, who is becoming a musician to pay for his studies, as Dad is not home.
Full of those wonderful Mexican 60's cinema clichés, Cesar Costa breaks into song without any real reason every now and then, sometimes during rehearsals, sometimes while romancing a wild young Angelica Maria, but at some point during the movie, he has a discussion about the wild young culture, and... he sings a "dissonant, musically clashing song... this sounds being the expression of our rebelliousness... a cry out for help and the understanding that we kids don't have... when our parents don't have the time for us, we find shelter in this wild, dissonant and rebellious music..." ...and then starts singing a Spanish version of "kissin' on the phone" by Paul Anka.
A dated movie, but still funny, although maybe for the wrong reasons. Watch it for a taste of the good IL' Mexican Rock movies...