Yes, I use the MIE lab with my music classes (grades 2-6). I analyzed my district's curriculum and identified all music theory skills which intersected with the MIE curriculum. My students really love using the lab - it's a "real world," music app...
I'm building a Teacher Technology Resource page and would greatly appreciate any suggested sites you are familiar with (links to resources which make your job easier, more effective, and will help provide long-lasting understanding of music).
Here...