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The same chord can stand on three different feet
Play a C major chord with C at the bottom, and it sounds solid and final. Play the same three notes with E at the bottom, and it sounds lighter, leaning forward. Play them with G at the bottom, and it sounds floating, waiting to move on. The notes are identical in all three cases: C, E and G. Only the lowest note changes, and that change is called the inversion. This trainer teaches you to hear it, so you can tell root position from first and second inversion by ear alone.
Inversions matter because they are everywhere in real music. A bass player rarely plays the root of every chord; walking bass lines move through inversions to connect chords smoothly. A hymn harmonisation that used root position for every chord would sound blocky and stiff, so arrangers use inversions to let the bass sing its own melody. If you can only recognise chord qualities, major versus minor, you miss half of what the bass is doing. Hearing inversions completes the picture.
How a round works
Choose a chord root and a quality, major or minor, then press the new round button. The tool plays a chord in a hidden inversion: root position, first inversion, or second inversion, chosen at random. Listen carefully to the lowest note, because that is the clue. Then press the button for the inversion you heard. The tool tells you whether you were right, names the correct inversion and its lowest note, and keeps your score.
The arpeggio button is your training wheel. It replays the same chord one note at a time, from the lowest note upward, so you can hear the bass note in isolation and compare it with the chord tones you know. Use it freely at first: hear the chord, guess, then play the arpeggio to check what the lowest note was. As you improve, try guessing before touching the arpeggio, and use it only to confirm.
What each inversion sounds like
Root position is the most stable. The lowest note is the chord’s root, the note the chord is named after, and the whole chord feels grounded. It is the sound of a final chord at the end of a song, and of most chord charts’ first beat. If a chord sounds like it could end the piece, it is probably in root position.
First inversion puts the third at the bottom. The third is the note that makes a chord major or minor, so first inversion chords have a distinctive colour: brighter in major, more tender in minor. They also feel less final, like a chord in motion, which is why they often appear in the middle of a phrase, passing between two root-position chords.
Second inversion puts the fifth at the bottom, and it is the least stable of the three. It often sounds like it needs to resolve, and composers use it in specific places, such as the cadential six-four chord before a final dominant, where the instability is the point. If a chord sounds like it is hovering and waiting for the next chord, second inversion is a good guess.
How to practise effectively
Start with one chord only, C major, and play twenty rounds on it. With the notes fixed, your ear can focus entirely on the bass note, and you will learn the three sounds as three distinct colours rather than three abstract labels. Then switch to A minor, which has a different emotional colour but the same inversion logic. Only after both feel easy should you randomise the root, because changing the chord and the inversion at once doubles the difficulty.
Sing the bass note after each chord. Hearing an inversion is partly a bass-listening skill: the upper notes stay the same, so the ear must separate the lowest voice from the rest. Singing it back forces that separation. If you cannot sing the bass note, play the arpeggio, sing along with its first note, and then replay the block chord while holding that note in mind. That loop, chord, arpeggio, chord again, is the fastest route to reliable recognition.
Inversions in songs you know
Listen to a simple pop ballad and follow the bass. You will often hear it step down through inversions while the chords above stay the same: a C chord with C in the bass, then the same chord with B in the bass as a passing note, then an A minor chord. That descending bass line is built from inversions and passing tones, and it is what makes a simple progression sound smooth instead of jumpy. Once you hear inversions, bass lines stop sounding random and start sounding composed, which is the moment this trainer has done its job.