Very good, and it is free.

I found this app while searching for other music apps. I got it on a whim and like it so far. It has not crashed and if you have thousands of songs then it will not repeat as much like some reviewers say. The only thing I wish that it defaulted to was a preset number of songs for the quiz. Instead it is infinite, I dont like this. However it can easily be changed. The options are very clear and concise.

ragallegos about Music Quiz!, v2.6