Understand · 2 of 3

Accompaniment angklung

One angklung, one chord. Four tubes sound a dominant seventh; hold one with the little finger, and what remains is a major triad.

Angklung

C3 mayor · 4/4 tubes sounding

Dominant seventh chord

C♯

E♭

F♯

A♭

B♭

The chord on a keyboard, for anyone who reads piano faster than tubes

These four tubes — root, third, fifth, seventh — are what make this a seventh chord. The name does not decide it; those four distances do.