The following definition appeared in the program for the first annual Jammys at Irving Plaza on June 22.

What Is a Jam Band?

Please cast aside any preconceptions that this phrase may evoke. The term, as it is commonly used today, references a rich palette of sounds and textures. These groups share a collective penchant for improvisation, a commitment to songcraft and a propensity to cross genre boundaries, drawing from a range of traditions including blues, bluegrass, funk, jazz, rock, psychedelia and even techno. In addition, the jam bands of today are unified by the nimble ears of their receptive listeners.