Kawehi is an awesome singer and musician, capable of creating pieces like this cover of Nirvana's Heart-Shaped Box. It's a phenomenal rendition executed only with her voice, a step sequencer, and a MIDI keyboard.
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Skip a bit to get to the start of the actual song if you're impatient or go through the whole thing to see how she sets the entire thing up.
You can support Kawehi's work in Kickstarter and follow her in Vimeo and Facebook.