This is true. It's a very well-made(compared to many others) so-called "Musicarello" movie. So where called Italian popular films, singing in the movie some of their hits , as a strange mixture of music videos as we understand them today and the neapolitan " sceneggiata" , a popular comedy based on the facts described in famous popular songs.In this one the plot is very weak, but there is not just "one" pop star, but A LOT of the teen-idols of that time, the so called "urlatori" (shouters) of the title, to distinguish them from "real singers" , à la Domenico Modugno, Claudio Villa etc. In this film the star is Joe Sentieri, which never became afterwards so popular as the very , very young Adriano Celentano and Mina ( both great! Mina sings "Tintarella di Luna" ) we can see, alongside with Brunetta ( aka Mara Pacini, really a one-hit- wonder) , the absolutely demented "Brutos" ( "Uglies") - with Aldo Maccione!- and , for some strange production reasons- a very young Chet Baker.He looks allucinated during all the movie, particularly in the scene when he is sleeping in a bath-tub, not disturbed by a party going on in the living room nearby. In fact, Adriano Celentano remembers that this was turned as he was effectively K.o. from having exceeded with alcohol or pills the evening before. A really nice one , a must-see if you like Italian pop music on the Sixties!