Musical arc, modified berimbau
Musical arc, modified berimbau, or: single string guitar, or string drum! Single string instrument to pluck, strum or hit (see the different videos), with or without piezo mic. All the guitar strings can be played for each chord in every pitches.
See the 3 videos below… In the second one, the playing is made with a slide… In the 3rd one, it’s a “fingerstyle” playing (string drum!)