The app is called Cheap Guitarist because it's the name of your YouTube channel but it can be used by any musician: keyboardists, guitarists, bassists, etc.

In it you can study Triads, where you choose a chord and need to hit its tonic, third and fifth. If I can't find it, just click on show and you will have the answer. Triads are fundamental in music because they are the basis of harmony. Composed of three notes, they form the simplest and most common chords, such as major, minor, augmented and diminished. Triads define the tonal character of a piece and are used to create harmonic progressions, which give structure and movement to songs. Furthermore, they are essential for improvisation and composition, allowing musicians to build chords and melodies in a cohesive and harmonious way.

In the same way, it is possible to find the pentatonic of any key. The pentatonic scale is fundamental in music due to its simplicity and versatility. With just five notes, it avoids semitones, resulting in a harmonious sound that is easy to use in various melodies and improvisations. It is widely used in genres such as rock, blues, jazz, and folk music from various cultures around the world. Its accessible structure allows musicians of all levels to create pleasing melodic phrases, making it an essential tool for musical composition and performance.
Furthermore, it is possible to study the cycle of fifths and fourths. The cycle of fifths and fourths is vital in music because it shows the relationships between notes and keys. The cycle of fifths facilitates the creation of harmonic progressions, smooth modulations and helps with instrument tuning. It also helps with memorizing key signatures and their respective keys. The cycle of fourths is essential for understanding common harmonic progressions, such as the II-V-I cadence, and is useful for practicing scales and chords, as well as supporting improvisation and musical theoretical understanding.

Another important function is that of relative scales. Relative scales are essential in music because they connect major and minor scales that share the same notes but have different roots. This relationship enriches harmony and facilitates smooth modulations between tones, expanding composition possibilities. Additionally, understanding relative scales helps musicians create emotional contrasts within a piece by alternating between major and minor modes, and provides a solid foundation for musical improvisation and arrangement.

That's it for now, but this app aims to become the world's first music teacher with artificial intelligence. Let's move forward and evolve.