Robert Glasper excels in the worlds of jazz piano, modern R&B and hip-hop. The first six cuts on Double Booked showcase Glasper the fiercely talented young jazz pianist. The second half of the album features Glasper the experimental hip-hop sideman and soulster (he's a part of pop vocalist Maxwell's band and helped Mos Def with his greatest commercial success, The Ecstatic). Both sides of his personality are artistically rewarding and illustrate how bop and hip-hop can -- and should -- work together seamlessly. Double Booked is a truly impressive achievement.