Music: Jam Session

Jazz—the real McCoy—has been defined as "collective improvisation." The Pentecostal gift of tongues is most likely to descend on jazz musicians when they are not hampered by printed notes. Improvisatory rituals, or jam sessions, are seldom open to the public. They take place in recording studios, or in musicians' homes. In Chicago, where U. S. jazz flowered in its second* great period, there used to be great jam sessions in hotspots after closing time. Then Union Boss Jimmy Petrillo, unable to see why a musician should play overtime for nothing, put his heavy foot down....

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