This is the lab I do when we are studying sound and sound waves. I have used it for both high school (ICP) and middle school. There are 6 stations set up. Materials needed are tuning forks, beakers, water, string, a ping pong ball, a metal spoon, and PVC pipes cut to different lengths. Of course this can be edited to match the materials you may or may not have. The kids LOVE this lab.
I have included a page for teacher notes on how I set it up and the demonstration I do before we do the lab. I also demonstrate what to do at each station before I let them start. The lab paper includes a few pre-lab questions and then questions the students have to answer at each station.