Very innovative approach. Being able to tailor the music to your current needs is fascinating. And as you say, we change our mood throughout the day so any other music might feel static if it doesn't change with us as well.
I like to train my body to respond to specific music in specific circumstances. Like classical conditioning. So if I pair a certain playlist with a certain behavior (e.g. writing an article) enough times I should be able to trigger my mind and body whenever I listen to that playlist and get me "in the zone". It's been effective I might say :)
Anyway, thanks for sharing this app with us. It might be the next level in our music listening experience that we didn't know we needed.