How to play Fsus4 (F Sus4) on Bass

Fsus4 is the F sus4 chord. It is built from 3 notes — F, A# and C — which sit at the root, perfect fourth and perfect fifth above the root F. Written as a formula that is 1P – 4P – 5P. Those intervals, not the note names, are what give the chord its character: move all of them to a different root and you still hear a sus4 chord.

Fsus4 on bass is a movable shape with no open strings, fretted between fret 1 and fret 3, the shape spans 3 frets, 2 strings are muted and should not sound — damp them with the underside of a fretting finger. Since the shape uses no open strings it is fully movable: slide it one fret higher and you have the same chord a semitone up, which is the cheapest way to learn eleven more chords from one hand position.

This chord has no third, so it is neither major nor minor. That ambiguity is the point: it sits comfortably under a melody that moves between the two, which is why shapes like this are so common in riff-based and folk playing. With only the triad and no added seventh, the chord is stable and finished-sounding, which makes it a natural place for a phrase to land.

Fsus4 belongs to 5 major keys, including C# major, where it is the iii chord, F major, where it is the I chord, Bb major, where it is the V chord, Eb major, where it is the ii chord and Ab major, where it is the vi chord. That is the practical reason to learn it: a chord that is diatonic to several keys turns up constantly, and knowing which degree it occupies tells you what tends to come next. A iii chord in C# major most often moves toward the tonic, so practising Fsus4 in the context of C# will teach you more than practising it in isolation.