SongPop Classic is a music trivia game app that lets you challenge other players in real-time to category-based quizzes. The system will play a set of snippets from various songs falling under a selected category, and you have to race against time to pick the correct answer from the choices available on the screen.
The fun aspect is the competition; while in a challenge, you get no time to second-guess but immediately make the move lest the opponent snags the point.