Music and Acoustics in the Mathematics classroom

I am currently teaching a hybrid algebra 2/trigonometry course this year. I know there is a ton of acoustics material that relates directly into my curriculum. In particular I am looking at exponential and logrithmic models (i.e. fret placement on string instruments) and modeling sound with trigonometric functions. I have a few online resources, but not enough to create an entire unit of study. Any help in this endeavor would be greatly appreciated.