shanali4

I ve read that singing out of tune means singing the wrong notes or singing in wrong pitch. Means that you should according to original song's notes or your relative pitch should be correct. Here two questions arise in my mind :
1. Can you tell if someone is singing out of tune if you never listened the original song or you dont have the sheet music of that song, since you don't know the notes of song, how can u tell if a person is singing out of tune ?

2. Many singers while singing cover songs of other singers, sing the completely different notes. Are they singing out of tune . For example: Many singers (Chriss Cornell, David Crook, Atif Aslam etc.) sung the Billie Jean of Micheal Jackon and changed the notes.

So what does singing out of tune exactly means