One of its predecessors was a sangaku [ja], a form of entertainment reminiscent of the modern-day circus, consisting mostly of acrobatics, juggling, and pantomime, sometimes combined with drum dancing.
During the 13th century, there was increased standardization of words, gestures, musical arrangements, and program combinations; as well as the adoption of the guild (za) system to which all present-day Noh schools can be traced.
The success of this one performance and the resultant shogunal patronage lifted the artform permanently out of the mists of its plebeian past.
The Japanese term "Sarugaku" is also used in other contexts to refer to a job or profession that seems to debase the employee or to treat him or her as a source of entertainment rather than as a professional.
[1] According to William Scott Wilson, Saragaku translates to "monkey music", is an ancient form of drama, and is the predecessor to Noh.