@DVJFan Most of the projects owned italodisco dancers did just that front lip sync. Jimmy McShane was one, the second point to some artists. I still have doubts, because of this video: Baltimora e Linda Wesley a "La Giostra" 1987
The group (Baltimora) is composed of four members, with the drummer, the guitarist and the keyboardist; but that day, these three were late -you can tell by the drum kit and the synthesizer already prepared on stage- so they told him : "O.K. let's just begin without them" ...that's how it happened... (don't take it seriously !...)