I think the judges/producers choose to make the contestants perform acoustically for the precise reason you've mentioned - if you're singing with music, you can (to a certain degree) hide missed notes, and don't have to be perform 'perfectly'. If you're performing acoustically, it lets the judges see the natural talent of the performers. Like Bo's acoustic performance in the top 3 - without music, he had to hit every note, or the performance would have failed miserably.
(Sorry if this isn't very clear, and forgive any typos please, cannot seee what I've typed because of the rather large cat in front of the moniutyor.)
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I think the judges/producers choose to make the contestants perform acoustically for the precise reason you've mentioned - if you're singing with music, you can (to a certain degree) hide missed notes, and don't have to be perform 'perfectly'. If you're performing acoustically, it lets the judges see the natural talent of the performers. Like Bo's acoustic performance in the top 3 - without music, he had to hit every note, or the performance would have failed miserably.
(Sorry if this isn't very clear, and forgive any typos please, cannot seee what I've typed because of the rather large cat in front of the moniutyor.)