I tested out some random songs on it, these are my results
Spring, vivaldi : 4 7777649 9877764 998 789 876 41 49878999 8764676764
Jingle Bells: 777 777 79467 888 8888 777766769
Melt, Hatsune Miku : 7644644764469776446446(67)(89)
Deck the Halls: 987646746786764
Good luck.