Anything can be used for an RC. It's best to find something that works for you, something you will recognize because it has meaning or stands out as easily recognizable.

Give it a try and report results. I know I always have music in my dreams.

Still, I doubt I would want to integrate "I'm Sexy And I Know It" into my dreams...

Might look for a catchy song that doesn't imply a meaning that your dream can latch onto.