A mathematics teacher, Robert MacCarthy, at Willard Middle School in Berkeley, CA has students compose music in order to teach mathematics concepts.
The kids show tremendous enthusiasm, and I have rarely seen a math teacher connect to students this way. I worked as a substitute teacher myself from 2004-2007 (see especially Oct. 17, 2008).
The “work” or song that the kids composed does sound a bit like hip-hop.
Update: February 23, 2016
See a story on the Issues blog about "art integration" (theater and dance) with math education in Virginia.