This is a real curiosity; at best a reasonable film, but also a charming little gem. There is a story (in the line of A Star is Born), but this merely serves as an excuse, as it is more importantly a kind of moving encyclopedia of about 35 stars making their debut in a talkie (although some of them had already made one talkie), of the technical sound possibilities and of film making.
Besides all that, it is entertaining and sometimes hilarious and it has fine one-liners that split my side. The film is also remarkable for making mock of typical German film genres (like the overly sweet romances involving the military), of too heavy acting and of film making in general. I have to mention this one: a short, hysterically funny parody of Der blaue Engel. What this film in fact says is: do not take any film too seriously.
This is one of those films that are very hard to trace in literature (although most participants were UFA stars, I could know find it in neither of the 2 UFA-history books I consulted) and are almost never shown. Recommended as a must-see for all those who are interested in (early) German cinema, I urge to see it when ever there is a chance.
As someone pointed out to me: it is said to think that this kind of unconcern, was finished with only 3 years later.