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What a slash chord is
A slash chord is written with a slash, like C/G or D/F sharp. The letter before the slash is the chord. The letter after the slash is the bass note, the lowest note that should sound. A normal C chord already has C as its lowest note in root position, so C/G is a small change with a big effect: the same chord, but G in the bass. That change can smooth a bass line, create a sense of movement, or add tension, depending on which bass note you choose.
Guitarists and keyboard players meet slash chords in almost every style. A bass line that walks down from C to A minor often passes through C/B, which is simply a C chord with B in the bass. The chord barely changes, but the bass moves, and the music flows. This builder shows the chord notes, the bass note, and the playing order, bass first and then the chord, so you can build any slash chord from its parts.
How to use the builder
- Choose the chord root, for example C.
- Choose the chord quality: major, minor, dominant 7, and so on.
- Choose the bass note, the note after the slash.
- Read the chord notes and the playing order, and check whether the bass note belongs to the chord.
A worked example
Build C/G. The C major chord is C, E and G. The bass note is G, which is already part of the chord. The playing order is therefore G, then C, then E: the bass first, followed by the remaining chord notes. Because the bass note belongs to the chord, C/G is an inversion, a rearrangement of a familiar chord, and it sounds smooth and stable. It is one of the most common slash chords in guitar music.
Now build C/D. The chord is still C, E and G, but the bass note D is not part of it. The playing order is D, then C, E and G. This is not an inversion; it is a chord with an added, non-chord bass note. It sounds more tense and colourful, and it works best when the tension is deliberate, for example as a passing chord between two stable chords. The builder flags this difference plainly, so you choose the effect on purpose rather than by accident.
Tips for using slash chords
- Use inversions, where the bass note belongs to the chord, to smooth bass lines between chords.
- Use non-chord bass notes sparingly, as passing colours. A whole song of them sounds restless.
- On guitar, the lowest note you play is the bass note. Mute any string below it, or the slash chord becomes a different chord.
- On piano, play the bass note with the left hand and the chord with the right. That separation makes slash chords easy to hear.
Honest limits
This is an educational theory helper. It follows standard semitone math and lists chord notes from standard chord formulas. It does not listen to your playing, and it does not choose voicings for your instrument: the playing order it shows is a guide, bass first and then the chord, and real voicings on guitar or piano will arrange those notes across octaves. Alternate tunings change string tension, so check your guitar’s setup before retuning, and never force a string far above its normal pitch. Let your ears judge the final result: theory names the chord, but music decides whether it works.
Who writes slash chords
Songwriters use slash chords to shape bass lines without changing the harmony, arrangers use them to voice chords smoothly between sections, and church musicians meet them weekly in chord charts where the bass must walk under familiar chords. Pop producers use them too, often without naming them, whenever a bass note steps through a chord. Learning to build slash chords deliberately, rather than copying them from charts, gives you control over one of the subtlest tools in harmony.