Sub Arturo plebs is a composition in three voices (tenor, motetus and triplum). Like all medieval motets, it has separate texts for each voice, which are sung simultaneously. All three texts are in Latin; the title under which the work is conventionally known in scholarship today consists of the opening words of each text. Their subject matter deals with music and musicians, following a tradition of similar "musician-motets" known from contemporary France.Bent, Margaret: Two 14th-century motets in praise of music. Lustleigh, 1977. It includes a named reference to the composer of the work, making him one of the earliest named English composers, and a self-referential description of the work's own structure.
