Keith Jarrett recorded this live album during three solo concerts in Paris and London in 2008. It is his first solo piano release after a several-year hiatus due to chronic fatigue syndrome.
The album features extensive improvisations showcasing Jarrett's lyrical and spontaneous style. Critics highlighted his ability to create complex structures in real time, with moments of great emotional intensity.
Testament was received with unanimous praise, considered a triumphant return. The recording captures the intimacy of live performance and the pianist's technical mastery, solidifying his legacy as a solo improviser.