[davidvaughan]

There's a pile of lovely Brazilian music using seven-string guitars. It's often used as a counterpoint to samba melodies and in the style known as 'choro'.

Yamandu Costa is worth a listen to hear how far a technically brilliant soloist can take the instrument.

[mendelsd]

You're going to love these guys:

https://youtu.be/H5ii0wnMEBs?t=41

https://youtu.be/3j0Jx9IThII

[EADGBE]

The additional lower bass string really lends itself to sambas, IMO. Or any self-accompanied guitar work.