Aside from being master MCs, the Beastie Boys have always been stellar instrumentalists and connoisseurs of culture. The band has always shown a knack for paying homage to their heroes and influences, but really shine musically on the handful of their instrumental LPs. The Mix-Up may not be as commercially successful as Ill Communication or Check Your Head, but you can really focus sonically on their full spectrum of the knowlege and appreciation of their influences.
Charles Mingus's brilliance as a bassist and composer is a given, but his skills as an arranger is one of the best reasons to listen to 1959's Mingus Ah Um. These selections capture Mingus's melodic sense beautifully -- adventurous and evocative, with a sense of joy on "Better Git It In Your Soul," sorrow on "Goodbye Pork Pie Hat," and genial chaos on "Bird Calls" -- and the balance of the instrumental voices is dazzling. A triumph.