When Cody Simpson recently stopped by Australia's 2DayFM, he casually picked up a guitar and starting playing some riffs from his upcoming acoustic album with Justin Bieber. No biggie.

Though Simpson explained that he couldn't sing anything yet, he did manage to wow all of the Angels in the crowd (and all of the Angels and Beliebers watching this now, of course) with the mellow, soothing riffs (and his impressive skill). And despite the lack of lyrics he was working with, the 'On My Mind' singer did manage to reveal some more details about that particular track.

"At the end of the song … there's a little call-and-repeat, where Justin will sing a riff and I'll follow it on the guitar," Simpson explained, demonstrating the guitar riff that accompanies it. Swoon!

Watch Cody Simpson play music from his upcoming duets album with Justin Bieber in the video above. And for more hints at what to expect from the record, watch the duo sing and perform a snippet of one of the songs here. Siiiigh.

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