23. My Morning Jacket, 'Z'
Underappreciated as vapo-session soundtrackers, MMJ have actually made a few classic 4:20 LPs. But this is the most perfectly-realized. "Gideon" is resplendent with meteor-shower guitars; "Dondante" is a slo-mo joint that explodes your head halfway through. But most surprising are the reggae grooves of "Off the Record" and "Wordless Chorus" – the latter an unlikely dub session filled with Jim James' ecstatically post-verbal falsetto wailing. Puff enough, and dude's gorgeous gibberish will sound like the wisdom of the ages.