Some of singers sounds really good at their record…even i found some incredibly high note that they could sing O_O how could they do that? I don't know if that's falsetto or not, but i think that it is not…it sounds natural…could somehow we edit the recording so that the falsetto part would sounds like a natural one?
In a recording studio, they get to re-do the same line to get it perfect as many times as they want..they are in a calm situation..with heaps of help around them trying to reach the right notes. Also when singing in a studio it sounds very different because of the walls and sound effects in it and all… Plus most voices are edited to reach a note and all..its amazing what technology can do these days.
Performing live is a lot different (obviously) most singers are moving around while losing breathe, concentrating on the notes and the performance plus they dont have time to re-do the lines on stage. Its a lot more pressure, the area and surroundings are different and they dont have someone there editing their voice to make it sound flawless. If you try singing in a studio, then singing infront of thousands LIVE is very different.