Ian Vine, a composer out of the United Kingdom, provides us with a conceptual piece of classical music.  From his Bandcamp site:

“Recently I have written a series of pieces that are concerned in one way or another with the presentation of unique, and yet similar, events or objects. In this work I examine closely a chord played by four guitars and bass guitar. There is no repetition in the piece, except gesturally..

five strings is presented in its original 36-minute version and also as five shorter pieces, five strings I-V.

In January 2021 I asked our mother, my brother and some of his childhood bandmates to record some guitar pitches that I sent to them in a score. My intention was to make a birthday piece for my brother vaguely in the same year as his fiftieth. For various reasons that didn’t happen and this isn’t that piece, it does however use some of the same material. Thank you to Elizabeth, Eamonn, Sean and Richard.”