No, not film genre. And not Michael Jackson’s “Thriller”.
This time the term is used for a young Croatian Music School, and it represents kind of decor in the world of music notations. Something like those sloppy curves above some notes. So I’ve used those “sloppy decorations” in my design.
After several ideas for logotype, I’ve made a sketches for Thriller diplomas. Note: “Thriller” is a music school for kids, that’s the reason my ideas are a bit of… childish. :)