Sergei Rachmaninoff figures prominently throughout Spring Forward, Fall Back, a story of fathers and sons and the sons that come next, of musical connection and of cultural identity. The Russian composer enters first as an unseen neighbor of the protaganist Richard’s younger self; he plays away unseen in the downstairs apartment he inhabits, much to Richard’s father’s annoyance. Perhaps in an act of rebellion, or perhaps out of genuine affection for his work, Rachmaninoff becomes…