Music to my ears
The hypothesis that the participants would be able to recognize the notes better when using only their left ears has been proven to be true.
The discovery that our left ears are more attuned to musical sounds while our right ears are better for listening to human speech is important for speech and hearing rehabilitation. This discovery has helped doctors to improve speech and hearing in children born with hearing disabilities as well as to rehabilitate people suffering from hearing loss.
Try to repeat the science fair project by comparing the ability to recognize musical tones among male and female participants and participants of different age groups.
The experiment can also be repeated to compare if the left ear is still more sensitive to musical notes if the participants are left-handed.
Tone deafness - http://en.wikipedia.org/wiki/Tone_deafness
Left ear vs right ear - http://soundmedicine.iu.edu/segment/939/Left-Ear-vs--Right-Ear
Speak to my right ear, sing to my left - http://www.abc.net.au/science/news/stories/s1197972.htm