Twenty-five years ago, at the Marlboro Festival, my then-new friend Mark Steinberg, the great violinist, convinced me to program and perform with him a sonata by Ferruccio Busoni. Not being then—or now—especially devoted to Busoni, I was a bit skeptical, but reading together through the sonata immediately convinced me. Studying and performing the work left a strong mark, yet its memory faded gradually as the years went by. But this past summer Mark and I came back to this piece, and its visionary, almost cosmic impact was again revelatory for me. Here is the first movement - Langsam - from our performance: