pitch/note

[Maybo]

He can sing high pitch.
He can sing high note.

Which one is correct?

 

[Raymott]

The pitch is the frequency of the note. Whatever you say, you need to use the article 'a'.
I'd say, "He can sing a high-pitched note."

 

[Rover_KE]

Also 'He can sing high notes.'

 

[emsr2d2]

It also might be true to say "He has a high-pitched voice" or "He sings in a high-pitched voice".