みゅートレ調号編 - 音楽理論トレーナーシリーズ Vol.1 is an app that allows you to easily learn music theory, which is essential for anyone who plays a musical instrument. By solving repetitive problems with just a tap, you can naturally grasp the concepts of music theory. This app is perfect for those who have previously struggled with learning music theory and are looking for a convenient way to train, especially during free time such as commuting.

The first volume of the Music Theory Trainer Series focuses on key signatures. With this app, you can quickly learn to identify keys just by looking at the key signatures, allowing you to instantly determine whether a key is major or minor.

The second volume covers intervals, which are crucial for understanding music theory. Without a solid understanding of intervals, it's difficult to grasp the concepts of music theory. The app provides an unlimited number of interval problems and even allows you to practice ear training by playing the interval sounds.

The app has been supervised by Shinnichi Fujii, a prominent jazz guitarist in the contemporary jazz scene.