They are fluxus event scores; brief instructions for performance art. See https://en.wikipedia.org/wiki/Fluxus#Event_score
These particular event scores were created by training a predictive recurrent neural network on the Fluxus Performance Workbook. ~5000 lines of output were then generated (about the length of the workbook itself), most of which was gibberish. These scores were selected as the most performable examples from out of that gibberish, and many were lightly edited to correct spelling or grammar. The titles remain unaltered. The first score, Solo, is my favorite, and required no editing at all.
Solo
Performer peas on the stage.
Symphony