pick up a guitar or keyboard and find the right key trying all of em. there are only 8
Actually there are 12 notes in an octave.
I posted a similar answer to this question elsewhere i think but what I would suggest is to play the vocal and set up a synth sound (like a pad) with some sustain and try each note in the octave to see what seems to work. To an untrained ear, this may be difficult at first though.
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