This looks really cool! I haven't tried this out yet, (I'm about to) but from the screenshots and description this almost gives me Virtual Cottage vibes. I love programs like this and I'm so glad I stumbled upon this one ^w^!
Update: I absolutely adore this, it's such a charming little program and I can tell a lot of love went into this! I will say, however, that I wish the music would either automatically repeat or continue on to the next song and loop through the playlist. It might take away from the whole "focusing" part of this program if the user has to constantly go back to make sure that music is playing. Other than that, lovely program! I can't wait to see more of your work ^w^.