A jam session is a relatively informal musical event, process, or activity where musicians, typically instrumentalists, play improvised solos and vamp over tunes, drones, songs, and chord progressions. To "jam" is to improvise music without extensive preparation or predefined arrangements, except for when the group is playing well-known jazz standards or covers of existing popular songs. Original jam sessions, also called "free flow sessions," are often used by musicians to develop new material (music) and find suitable arrangements. Both styles can be used simply as a social gathering and communal practice session. Jam sessions may be based upon existing songs or forms, may be loosely based on an agreed chord progression or chart suggested by one participant, or may be wholly improvisational. Jam sessions can range from very loose gatherings of amateurs to evenings where a jam session coordinator or host acts as a "gatekeeper" so that appropriate-level performers take the stage to sophisticated improvised recording sessions by professionals which are intended to be broadcast live on radio or TV or edited and released to the public.

Minton's Playhouse is a jazz club and bar located on the first floor of the Cecil Hotel at 210 West 118th Street in Harlem, Manhattan, New York City. It is a registered trademark of Housing and Services, Inc. a New York City nonprofit provider of supportive housing. The door to the actual club itself is at 206 West 118th Street where there is a small plaque. Minton's was founded by tenor saxophonist Henry Minton in 1938. Minton's is known for its role in the development of modern jazz, also known as bebop, where in its jam sessions in the early 1940s, Thelonious Monk, Bud Powell, Kenny Clarke, Charlie Christian, Charlie Parker and Dizzy Gillespie pioneered the new music. Minton's thrived for three decades until its decline near the end of the 1960s, and its eventual closure in 1974. After being closed for more than 30 years, the newly remodeled club reopened on May 19, 2006, under the name Uptown Lounge at Minton's Playhouse, which operated until 2010, before re-opening as Minton's Playhouse in 2013.