A new CD box set from Rhino/Warner will collect ten of Joni Mitchell‘s studio albums. The Studio Albums 1968-1979, out October 29, surveys Mitchell’s discography from the folk-rock poetry of 1968’s Song to a Seagull through to her more exploratory jazz collaboration with Charlies Mingus, 1979’s Mingus. All ten discs come in a clamshell box, with gatefold card wallets that mimic the…