Illustration Friday - Duet

This is a very busy week and I want to get started on a commissioned piece that I'm super excited about.  However, I love the word "duet" so I didn't want to let this Illustration Friday get away from me.
Here's a little collage from my art journal.  I throw random bits of left over paint and paper into it  to see what I can discover when I'm not trying to acheive anything in particular.  This diagram of a blocking oscillator reminded of the concept of a duet. I really have no idea what a blocking oscillator is, but it sounds cool!   So I added the word and a little color with GIMP and voila.