How to Build a Suspended Chord With an Altered Fifth

A basic major chord contains the root, major third, and perfect fifth: 1–3–5. A suspended chord replaces that third. In sus2, the replacement is the major second, giving 1–2–5. In sus4, it is the perfect fourth, giving 1–4–5. Fender illustrates these constructions with Csus2, C–D–G, and Csus4, C–F–G. The Sus-Piciously Easy Way to Liven Up Basic Chords

For this task, write the ordinary suspended chord before changing its fifth. That separates two decisions: which note replaces the third, and what happens to the fifth. If you start with C–F–G, the F is the suspended fourth and G is the note you will alter.

A chord marked simply sus commonly means sus4. Writing the numeral explicitly is helpful here because you are already adding another instruction to the symbol. Simple “Sus” Chords

Here, an altered fifth means either a lowered fifth, ♭5, or a raised fifth, ♯5. Lowering a perfect fifth by one semitone produces a diminished fifth; raising it by one semitone produces an augmented fifth. These follow the interval definitions in Robert Hutchinson’s music-theory textbook. Augmented and Diminished Intervals

With C as the root, the ordinary fifth is G. Its lowered form is G♭, and its raised form is G♯. Keep the fifth’s letter name when spelling the alteration: the point is to show what happened to G. In this basic construction, the altered fifth replaces the ordinary fifth.

Combining the two suspension choices with the two fifth alterations gives four starting formulas. Fretly’s own chord reference explicitly documents all four, including their symbols and semitone structures. Chord names, symbols and formulas

Chord	Formula	C-root notes	Semitones above the root
Csus2(♭5)	1–2–♭5	C–D–G♭	0–2–6
Csus2(♯5)	1–2–♯5	C–D–G♯	0–2–8
Csus4(♭5)	1–4–♭5	C–F–G♭	0–5–6
Csus4(♯5)	1–4–♯5	C–F–G♯	0–5–8

Use this sequence whenever you encounter an unfamiliar root or chord symbol. The examples below apply the interval rules above; they are worked constructions, rather than excerpts from a particular composition.

1. Choose the root. Use D for this example.
2. Find its ordinary fifth. D’s perfect fifth is A.
3. Choose the suspension. The second above D is E; the fourth is G.
4. Alter the fifth. Lower A to A♭ for ♭5, or raise it to A♯ for ♯5.
5. Assemble and label the notes. D–G–A♭ is Dsus4(♭5); D–E–A♯ is Dsus2(♯5).

Notice that the suspension stays unchanged while the fifth moves. To turn Dsus4 into Dsus4(♭5), keep D and G and lower A. Moving G instead would alter the fourth and produce a different construction.

For a root with an accidental, follow the same process rather than adding the symbol’s accidental mechanically. Starting from B♭, the perfect fifth is F and the fourth is E♭. Therefore, B♭sus4(♯5) is B♭–E♭–F♯. The sharp-five instruction raises the fifth relative to its normal position above the root.

Before playing, read your notes back as intervals: root, second or fourth, altered fifth. This small check catches errors that can hide inside a familiar keyboard or fretboard pattern.

On a keyboard, use C as the root and play the four note sets in the table, one at a time. Begin in a middle register with the notes in ascending order. Play the ordinary Csus2 or Csus4 immediately before its altered version so you can hear the effect of moving just the fifth.

For a controlled comparison, use this original practice sequence. Hold every chord for four even beats and keep the volume consistent:

• C–D–G → C–D–G♭ → C–D–G → C–D–G♯.
• C–F–G → C–F–G♭ → C–F–G → C–F–G♯.

The Csus4(♭5) example places F directly beside G♭. Listen to that adjacent pair first. Then move F up an octave while keeping C and G♭ where they are. Compare the two arrangements and choose the spacing that suits your passage. This is a voicing experiment: you are changing the placement of the same chord tones.

On guitar, begin with a three-note voicing you can identify note by note. Locate the fifth and move that pitch one fret down or up. If a shape doubles the ordinary fifth on another string, change or omit that duplicate for this exercise. Check the remaining strings individually so the resulting notes match your intended formula.

Avoid judging the whole chord family from one difficult fingering. Try the notes as an arpeggio, or in another register, before deciding whether a particular construction belongs in your music.

A practical decision aid is to choose the movement first. Identify the note you want to hear change, then build the chord that makes that movement possible. The following are original exercises derived from the formulas, with every pitch supplied.

Musical experiment	Play these notes	What to listen for
Restore a lowered fifth	C–F–G♭ → C–F–G	G♭ rises to G; C and F remain
Restore a raised fifth	C–F–G♯ → C–F–G	G♯ falls to G; C and F remain
Change the suspension only	C–F–G♯ → C–E–G♯	F falls to E; the raised fifth remains
Change both altered tones	C–F–G♭ → C–E–G	F falls to E while G♭ rises to G

Play each pair slowly. In the first two, the fifth moves while the suspension stays. In the third, the fourth moves while the altered fifth stays. The fourth combines both changes. Keeping these actions separate during practice makes it easier to identify which movement you want.

Next, try a three-stage phrase: Csus4(♯5) → Csus4 → C, using C–F–G♯ → C–F–G → C–E–G. Give each stage two beats, then repeat with different durations. Choose whether the raised fifth or the suspended fourth should receive more time.

These exercises offer possible continuations, rather than prescribing a single destination. Your melody supplies another useful test: play it above the chosen voicing and listen to the actual combined notes before committing to the chord symbol.

Use an explicit symbol such as Csus4(♭5) or Dsus2(♯5). Fretly lists these parenthesized forms alongside other spellings. For an unfamiliar voicing, supplying the written notes as well makes the intended result easier to reproduce. Chord names, symbols and formulas

Check three things when your result differs from what you expected:

• Check the third. In these basic suspended constructions, remove the third before inserting the second or fourth. Fender’s examples make that replacement explicit. Fender’s suspended-chord guide
• Check every fifth. For the exercises here, replace the ordinary fifth wherever it occurs in the voicing.
• Check the note you moved. A ♭5 or ♯5 instruction changes the fifth; keep the chosen second or fourth intact.

Finish by building one chord without a diagram: choose a root, write its second or fourth, find its perfect fifth, and move that fifth one semitone. Play your three notes, compare them with the unaltered suspended chord, and try one continuation from the movement table. You now have a repeatable method for constructing the chord and deciding how to use it.

• Simple “Sus” Chords — Music Theory for the 21st-Century Classroom
• Augmented and Diminished Intervals — Music Theory for the 21st-Century Classroom
• The Sus-Piciously Easy Way to Liven Up Basic Chords — Fender
• Chord names, symbols and formulas — Fretly