Half a century. That’s how old Trout Mask Replica, the masterpiece by Captain Beefheart and his Magic Band, turned in June. Its 28 songs, with a total duration of more than 78 minutes, are like a trip into the mind and unique creativity of an under-celebrated musical genius. Trout Mask Replica’s tracks defy generic classification. There’s avant-garde jazz; there’s old-school R&B; there’s spare, stripped-down blues; and there’s what you could call precursors of music that would much later come to be labelled punk and garage rock. And last but not least, there’s the producer of the album—none other than a man named Frank Zappa, another eccentric pioneer in his own right.