Jazz’s current youth movement clearly has different prerogatives than its predecessor. Where Wynton Marsalis’ buzzword was tradition, for trumpeter Christian Scott, the action is in the streets and over the airwaves, as borne out by his third disc’s politically charged song titles and Thom Yorke cover. On Yesterday You Said Tomorrow, Scott’s muted tone often echoes Miles Davis’, and his guitar-animated quintet can get raucous. Pianist Milton Fletcher is the disc’s traffic cop, standing at Scott’s intersection of past and future. A?