Kevin Whitehead

Saxophonist Jan Garbarek was a teenage protege of American composer George Russell in Norway in the 1960s and later played in Keith Jarrett's Scandinavian quartet. More recently, he has collaborated with the vocal quartet the Hilliard Ensemble, improvising as they sing medieval music.

Gil Evans, born a century ago this year, was a leading jazz arranger and composer starting in the 1940s, when he wrote for big bands. He helped organize Miles Davis' Birth of the Cool sessions, then arranged Davis' celebrated orchestra albums like Sketches of Spain. Evans, who had his own big bands that went electric in the 1970s and '80s, died in 1991, but some of his rare music has been newly recorded.

Many jazz musicians, the kind who wear jackets and ties on stage, are often carelessly referred to as playing bebop. In reality most of them are post-boppers, who build on that dynamic style that burst forth after World War II, without bringing it back in pure form. It's the rare modernist who gets an authentic bebop sound on alto saxophone, who catches some of the raw explosiveness and rapid-fire grace of jazz god Charlie Parker. And then there's Jesse Davis.

The jazz musician Ravi Coltrane, 47, didn't make his burden any lighter by choosing to play tenor and soprano saxophones — the same instruments his father, John Coltrane, indelibly stamped with his influence.

Ravi knew early he needed his own voice. On tenor, he has his own ways of bending and inflecting a note, applying flexible vibrato. Even when his noble sound bears witness to his heritage, Ravi Coltrane can draw on his father's language and make it his own.

In a good jazz rhythm section, the players function independently and as one. Their parts and accents crisscross and reinforce each other, interlocking like West African drummers. Beyond that, the bass is a band's ground floor. When it changes up, the earth shifts under all the players' feet. From moment to moment, Linda Oh's bass prowls or gallops, takes giant downward leaps, or stands its ground.