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.
to lead or guide; escort: to conduct a tour. to serve as a channel or medium for (heat, electricity, sound, etc.): Copper conducts electricity. to lead. to act as conductor, or leader of a musical group, by communicating to the performers by motions of a baton or the hands his or her interpretation of the music.