Ab In Sen Scale

What is the Ab In Sen Scale?

The In Sen scale is a five-note Japanese scale with a distinctively dark, sparse character — defined by its minor 2nd from the root and the wide gaps between its upper tones. It's rooted in traditional Japanese shakuhachi and koto music but has been adopted by modern ambient and experimental guitarists for its stark, meditative quality. Here's how the Ab In Sen Scale lays out on the fretboard. This scale is enharmonically equivalent to G# In Sen.

Notes and Positions

Japanese pentatonic with a dark, suspenseful quality. On bass, this scale becomes a toolkit for strong roots, passing tones, and melodic fills that still support the groove. Think in root-on-E and root-on-A boxes, then adapt the same notes for 5-string bass when the low B string gives you another root below the pattern. In the key of Ab, the notes are: Ab, Bbb, Db, Eb, Gb.

How to Use It

You'll often hear it in Japanese Traditional, Film, and Metal. A good way to internalize the sound is to sing the root, then sing a few scale degrees before you play them.

Build two-bar bass lines that return to the root before experimenting with wider melodic movement. Use the interactive fretboard above to spot repeats of the same note on different strings and frets.