Improvisation is playing around, and in music, it comes out as jazz. Stan Kenton was the leader of several progressive jazz bands in the 1940s and 1950s. Emotional, radical, unpredictable, and original are adjectives frequently used to describe his records. Kenton in Hi-Fi, recorded in 1956, is a good sampling of this sound with Kenton on piano and members of his various bands on saxophones, trombones, trumpets, guitars, and percussion. Included are two of Kenton's theme songs, "Artistry in Rhythm" and "Eager Beaver."

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