Umberto Tozzi only really had one big hit in his career. That was the 1979 song 'Gloria'. It was written and composed by Tozzi and Giancarlo Bigazzi with English lyrics written later by Trevor Veitch.
Their first big hit is ''Pressure''
True
The Jonas Brothers first real hit was "Mandy" which premeired on MTV.
1990
"Fallin'"
Yes
baby
in terms of film it was The Big Boss (1971)
Saturday Night Fever was John Travolta's first big box-office hit.
the reason why we sing
What Makes You Beautiful
A big break is a breakthrough, especially the first big hit of a previously unknown performer.