I'm a lazy fuck so take the description from their homepage
What is Anime Music Quiz?
Anime Music Quiz is, you guessed it, a quiz game about Anime Music! Inspired by the popular “guess the opening/ending song” quizzes, that are all about matching a set of anime songs to their anime. Anime Music Quiz takes these quizzes one step further! Thanks to the ever expanding community driven song database, an unlimited amount of unique quizzes can be generated. Furthermore you can add your MyAnimeList account to have your quizzes personalised by the anime you’ve watched, while still throwing in new and fresh anime for you to discover!
Play With Others
Playing a quiz by yourself is all fun and great, but it becomes even greater when sharing with others! So grab some friends or meet some new people with a passion for anime. Anime Music Quiz supports up to 8 players in each quiz! Competing against each other is all great and fun, but you can also share a laugh, discuss recent anime or recommend your favorites through the integrated chat.