I had the same question. Until I found that I should press the arrow in the box, instead of the arrow near the bottom bar... (Ahh, I love other music games, and this one has no music?!)
That is my fault--nonintutive interface. With this one, you need to select the songs you like and they are added to the list in the box. When you press play, that list plays. The idea was to create some customization without a login. Please see if that works for you.
This is really cool. I suspect a lot of people didn't get far enough to actually try anything; it took a lot of clicks to start the first note.
A suggestion: don't vanish the instructions once the song appears! Once I saw the song loading would take a while, I switched to a different tab, and when I came back they were gone.
Hmm interesting. I always knew I had to press and hold with different pressure on songs in my library to pull up different menus but I didn't realize that this is what that was. Thanks
Oh man. I tried it out for a little bit but gave up when I absolutely could not find any way to skip a track I didn't like. Never occurred to me that it might be hidden behind the popup.
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