The discussion was originally about how is it that all professional singers can sing so ridiculously high. It seemed odd to me that pretty much all of them are Mezzo-sopranos. If ronws is correct though, it may just be that all sheet music is written an octave higher than it actually is e.g. Nessun Doruma going up to a B4 in the chorus, even though the music says B5. Is anyone able to confirm this? I can't seem to find much on it on the internet. Ronws - I agree it would be good just to listen to the song and match it, it's just that a lot of these people sound much higher than I do, especially Ed Sheeran. If I sing an A5 in the chorus of thinking out loud it sounds too low, but may just be that his voice tone is a lot brighter than mine. This would be a complete revelation for me if it's true! I might have just spent years with bad instructors, thinking that songs are an octave higher than they are and it may actually be more about my tone quality. Thanks