Exhausted all the conventional open tunings? Try the adventurous Aadd9 tuning: here are 5 chord shapes you need to know

Once you've whetted your appetite for open tuning experimentation, your acoustic guitar having long forgotten the vanilla pleasures of EADGBE, maybe it's time to try open Aadd9 (EAC#EBE).

This tuning is a bit more of a rarity, and is the main tuning used by Australian virtuoso Alan Gogoll.

The tuning has a wide open sound all of its own, with the brightness of a major 3rd interval (C#) and the richness of a 9th (B) giving the signature sound.

It won’t disrupt your neck/string tension much, either – simply drop the fourth string by a semitone and the third string by three semitones.

1. Aadd9

Use your second and third fingers to fret the notes on the sixth and third strings. Strum all six strings and let it ring!

2. Bsus2/4

This chord is created by moving the previous shape up by two frets. Try other fret positions, too.

3. C#madd9

This time, instead of changing fret position, we’re moving the shape on the fifth and second strings.

4. Eadd9

If we barre across the top five strings at the 7th fret, a large Eadd9 chord is created.

5. Aadd9

This shape has a jazzier character to the opening Aadd9 thanks to a wider pitch range and fewer ringing open strings.