> I guess you need to learn to apply those sharps and flats though, of course.
Yeah, there's a big difference between fingered instruments and singing. When you're playing on a fingered instrument, it's quite easy to apply incidentals – you get a feeling for the shape of the scale (and you practice scales to help with that). But unless you have perfect pitch, you're only _ever_ singing intervals. And good luck when the key changes from F# Major to Eb Minor halfway through the piece!
Another factor is that these singers likely do not play any other instruments, so they don't have any visual or tactile reference for sharps or flats – all keys are sung exactly the same way. When you're singing "by ear", you place the note in the scale you're singing.
Yeah, there's a big difference between fingered instruments and singing. When you're playing on a fingered instrument, it's quite easy to apply incidentals – you get a feeling for the shape of the scale (and you practice scales to help with that). But unless you have perfect pitch, you're only _ever_ singing intervals. And good luck when the key changes from F# Major to Eb Minor halfway through the piece!
Another factor is that these singers likely do not play any other instruments, so they don't have any visual or tactile reference for sharps or flats – all keys are sung exactly the same way. When you're singing "by ear", you place the note in the scale you're singing.