I like it, it's just too luck based for me. Normally with card games you can count, but that doesn't really work here. Plus because I and my opponent knew exactly what cards the other had nobody ever got to play and it came down to whoever had the more damage dealing cards. I think what would be really cool is if you had more than twenty different scales to choose from and more than 10 cards so you could make the largest strings to deal more damage instead of hoping you don't get another D if you already have two D's. Obviously making music in 20 different scales sounds like quite a task, I'm pretty sure you can just write your music in 1 to 7 instead of in a particular scale and just create the music in engine. Now make a different track for music with a 1 to 8 scale and you've got tons of possibilities. You would play against that one guy who starts using the Italian enigmatic scale. Maybe even include the chromatic scale, as it would be really satisfying I think.
Definitely a cool game though. Approved.