LED Strip Light Audio Visualiser

This was one of my old projects where I turned the LED strip lights in my desk into an audio visualiser using an Arduino Nano. Unfortunately this was the only video I have of it and have since taken the strip lights out of my desk for use in other projects.
Song: Nightcore - War Child (Hollywood Undead) • Video

[@Mpinecone]

Is this using a mic or the audio from the computer's sound card?