This is "Musical Scales" from the "Play and Learn!" series.
In this app, you listen to a note and then answer which note it is. One, two or three single notes. If you increase the number of your friends, you can try three-note chords.
10 questions will be asked. See if you can get 100 percent correct.
The ranking is done in order of high score and fastest time.
Play with a friend or have a showdown between parent and child.