Derek Bailey's book titled "Improvisation," originally published in 1980 and now updated and expanded with new interviews and photos, is the first to examine the nature of improvisation in all its forms, such as Indian music, flamenco, baroque music, organ music, rock, jazz, contemporary, and "free" music. Through discussions with some of today's leading improvisers, such as John Zorn, Jerry Garcia, Steve Howe, Steve Lacy, Lionel Salter, Earle Brown, Paco Peña, Max Roach, Evan Parker, and Ronnie Scott, Bailey offers a clear insight into the astonishing variety of possibilities encompassed in the practice of improvisation, while highlighting its importance as a foundation for musical creation.