Music Theory Companion

Master music theory with Music Theory Companion, the comprehensive learning tool designed for musicians at every level—from absolute beginners to seasoned composers. Whether you're developing your ear, writing songs, or perfecting your technique on guitar or piano, this app gives you everything you need to unlock your musical potential in one unified platform.

Explore an extensive library of musical knowledge built for real-world musicianship. Access 86 unique scales and modes with their diatonic chord formations, discover matching chords and scales for any musical idea, and visualize harmonic relationships through the interactive circle of fifths. With over 1,000 chords in the library—complete with construction details—you'll find instant answers to every harmonic question. The chord progression tool helps you plan smooth key changes and modulations, while the Neo-Riemannian voice leading feature guides advanced harmonic movement through the Cube Dance visualization.

Develop your ear and refine your technique with built-in practice tools. Train interval recognition with dedicated ear training exercises, practice scales using the accurate pitch detector, and strengthen your relative pitch perception. Whether you play guitar, piano, or sing, the realistic instrument interfaces let you apply theory directly to your instrument. The interactive piano keyboard and guitar fretboard—supporting both left-handed and right-handed configurations—respond with authentic instrument sounds. Sync your practice sessions with the highly configurable metronome, featuring adjustable tempo and custom sound options for focused, effective training.

Access instant references whenever you need them. Musical symbols, music theory concepts, staff notation in both treble and bass clefs, and analytical labels like secondary dominants help you learn the language of music. View similar and relative scales, compatible scales for any chord, and common scale degrees—all explained with precision. The intuitive interface makes navigation effortless, whether you're composing, studying for exams, or exploring new harmonic possibilities.

Music Theory Companion supports both sharp and flat notation, handles all 12 keys, and adapts to your learning pace. Perfect for songwriting, composition, arrangement, ear development, sight reading, vocal training, and music theory study, this app is the essential companion for anyone serious about understanding and creating music.