#1
I have to do science fair this year, and I wanted to do something with guitar or just music in general, do you guys have any ideas? Please, no ideas with human subjects, I have to do it on at least 100 people if my project involves humans. It also has to be at high school level.
I go to eleven..........
#2
You could use the standing waves idea to demonstrate destructive and constructive interference and then get people to stand in the different areas and hear the differences
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#3
You could do string tensions. thats what i did.

Just a thought...
#4
It would be cool to play music and see peoples subconcious changes that differ between music in a major key and music in a minor key.

For example, have people take a short test while you play some happy/major key music and have another group of people take the same test while listening to sad/minor key music. See what group has the higher average score.