I was really frustrated when I clicked the link. It looked like something I might enjoy (it looks music related!) Is it an ear-trainer? Synth? Song-learning to

I was really frustrated when I clicked the link. It looked like something I might enjoy (it looks music related!) Is it an ear-trainer? Synth? Song-learning tool? Haven't seen the video yet (which I only found after I managed to hunt down a link to the homepage.)