The 'legendary' mantric tape by Jackson MacLow based on the "Gathas" constituting an open-ended series of performance texts begun in 1961. The letters of their words are placed in the squares of qudrille ("graph") paper, and they are realized through spontaneous, but rule-guided, performers' choices, usually, but not always, made during performances. The Sanskrit word gatha, "verse" or "hymn," was adopted for them, on analogy with its use to designate versified sections of Buddhist sutras a…