Any newly discovered music from a legend on the order of John Coltrane is an event. But the reason advance buzz has been particularly feverish for Both Directions at Once: The Lost Album, a previously unissued session from March of 1963, is that it comes from the era of his so-called Classic Quartet. Simply put, the group – featuring pianist McCoy Tyner, bassist Jimmy Garrison and drummer Elvin Jones – was Coltrane’s greatest band, a unit perfectly poised between hard-edged swing and gravity-defying exploration. And here, suddenly, we have 90 minutes of excellent-sounding material from them that most never knew existed.