Open D is Julia Jacklin's go-to tuning.

Open D.

She uses it for the bulk of her songs — gives that warm, slightly dissonant, fingerpicked sound. It’s not standard tuning. If you’re learning her songs, tune your guitar to D A D F# A D. It makes the chords easy (slide barre shapes). Most of her fingerpicking patterns live in that tuning. You’ll hear it on “Pool Party,” “Don’t Know How to Keep Loving You,” “Head Alone,” etc.

It’s worth learning open D just for her catalog.