Update README.md (#2)

- Update README.md (6af479a6740606dca5f11173eb93603fcfe81912)


Co-authored-by: Galen Wei <conjunct@users.noreply.huggingface.co>

README.md

@@ -1,3 +1,5 @@
----
-license: cc-by-nc-sa-4.0
----
+---
+license: cc-by-nc-sa-4.0
+---
+
+Derived from Aria-MIDI. https://voicings.pianodb.org/. https://github.com/pianodb/voicings-web.