Ethan Iverson Curates Sono Fest; Han Chen’s Ligeti Like many listeners, I first became acquainted with pianist Ethan Iverson via The Bad Plus recording These are the Vistas, which contained strong originals and a jaw-dropping rendition of Nirvana’s “Smells Like Teen Spirit.” Several albums later, Iverson moved on from The Bad Plus to a variety of projects. His blog Do the Math outlines his work as an educator (at New England Conservatory) and a variety of interests that, unsurprisingly, focus on jazz, but also encompass twentieth and twenty-first century concert music. Starting next week, he brings his omnivorous musical instincts,