Kevin Whitehead

Akinmusire would rather fit into a cohesive band and spread the solos around than put himself way out front.

The Impulse jazz label, famous for its fold-out black and orange album covers, turns 50 this year. To celebrate, the label has released a box set featuring its early releases. Jazz critic Kevin Whitehead says the set showcases the diversity and talent of the musicians Impulse recorded.

Saxophonist Tim Berne came up on New York's so-called "downtown scene" 30 years ago. That scene is known for postmodern jump-cutters like John Zorn, who'd leap from one style to another in the space of a beat. But Berne went another way; he's fascinated by gradual transitions.