With bebop, jazz shifted to the paradigm still in place today: a subcultural art music played primarily by small combos in a jam-session format, favoring solo improvisation and aimed at a specialized market of aficionados.
A conductor is a person who stands in front of an orchestra or choir and directs its performance. On a bus, the conductor is the person whose job is to sell tickets to the passengers. On a train, a conductor is a person whose job is to travel on the train in order to help passengers and check tickets.
Neutral is a circuit conductor that normally carries current back to the source, and is connected to ground (earth) at the main electrical panel. In the electrical trade, the conductor of a 2-wire circuit connected to the supply neutral point and earth ground is referred to as the neutral.