Is this the Peloton for piano? Lumi Keys by Roli is a multi-layered approach to teaching piano with a rainbow midi keyboard, interactive video lessons, games and a vast library of hit songs. See the newest game coming to the Lumi app, Springboard, a platform jumping challenge. Bridget Carey explains how Lumi works for beginners and those with music experience — and how a few days with Lumi got her back in the swing of playing the keyboard.