Heart's dynamic performance at the Illinois State Fair in August proved that the act hasn't lost a vocal step, even after decades together. Equally, uh, heartening was a cameo cover performed by Shara Worden and Becky Stark during orchestral-indie-rockers the Decemberists' sold-out Pageant show this past spring. The two ladies — who as solo artists record under the names My Brightest Diamond (Worden) and Lavender Diamond (Stark) — echoed the powerful pipes of Heart principals Ann and Nancy Wilson for a stunning "Crazy on You." Worden stalked the stage like a cougar on the prowl, her PJ Harvey-meets-Robert Plant voice hitting the high notes with the grace of a trapeze artist, while Stark's movements and wails resembled those of a docile gazelle. The delighted crowd whooped and cheered as the song progressed — and went positively bananas when the pair finally harmonized at the tune's denouement, their voices combining with the sheer force of a hurricane.