Are you tone deaf? http://www.jakemandell.com/tonedeaf/
I'm a jazz pianist and expected to shine. I spend time transcribing solos and playing "by ear" without (I thought) altering anything I heard. I spent hours and hours in my life concentrating on musical phrases and expected a 100% score. However, my score is 80.6%. Test was difficult (only one hearing of each sample), and humbling.