Rajas is one of the three Gunas (qualities of the world). Rajas is passion, which may manifest in action, energy or motion. So any time you feel highly motivated to do something, you are entering into the Rajasic realm. This is where the world moves forward. Perhaps this music will move you there.
For those times when thoughts won't form into words, and words don't say what you said, or mean what you meant: It's time to let the music do the talking.