Longtime friends and one-time lovers Joni Mitchell and Leonard Cohen are two of the most influential songwriters and storytellers of the past 50 years. Celebrate their mutual influence on the other’s work with some of their beloved chart-toppers including “Cactus Tree,” “Hallelujah,” “Big Yellow Taxi,” “Suzanne,” “Both Sides Now” and many other unforgettable tunes that defined a generation.