Jam session

A jam session is a musical act where musicians gather and play (or "jam") without extensive prepara

A jam session is a musical act where musicians gather and play (or "jam") without extensive preparation or predefined arrangements.

The origin of the term jam in this context can be traced back to the 1920s. According to the , the term originally appeared ca. 1929, referring to a "short, free improvised passage performed by the whole band". The derivation of this usage is obscure, but like other novel terms that came into English through jazz music -- such as the terms "hip", "hep" and "hepcat"—it is possible that it ultimately derives from the West African Wolof language.