Tom Huizenga We rarely invite the same band back to the Tiny Desk. But the beloved Kronos Quartet, which first played our offices 12 years ago, isn't the same band. Three of the four members are brand new: Cellist Paul Wianko succeeded Suny Yang; violinist Gabriela Diaz and violist Ayane Kozasa replaced retiring original members John Sherba and Hank Dutt. The newly rejuvenated quartet, still under the durable leadership of violinist and founder David Harrington, appears to be having more fun than ever. And it shows in these vigorous performances of pieces that are whimsical and socially conscious. Neil Young wrote "Ohio" in the wake of the Kent State shootings in 1970, and Wianko's new arrangement, with its jolts of defiance, reverberates disturbingly today. A similar urgency pervades Billie Holiday's staple "Strange Fruit," which Harrington views as "the centerpiece of American music." The quartet arrangement struts a melodramatic introduction that gracefully slips into the song's languid despondency.…