I really enjoy math...
So I really enjoy when someone makes a duet of math and music. Here are some sources to get you started.
Exploring Measurement, Sequences, and Curves with Stringed Instruments, by NCTM
Observations about Piano Keys from MathPages
The Science and Mathematics of Sound, Frequency, and Pitch from Khan Aacademy
The Math Behind Beethoven's Music from the Ted-Ed Blog
The Interesting Connection between Math and Music from the Vancouver Sun
God by the Numbers from Christianity Today (preview article)
Visualizing the Music Genre Space - Graphing Music
Online Knitting Calculator - Math and Creative Arts Arts
Creating a Computer Generated Dance - Math & Dance
Pi Day with Vi Hart - Song created from the digits of Pi
Fractals and Cauliflower - Food and math