You love him. You really love him. Who wouldn’t? Joshua Roman is a curly-headed Dionysus of a cellist. He was once the youngest principal player in Seattle Symphony. Though he broke off to pursue his own career, he oversees classical music at Town Hall and still pops up now and again, including in this program with an all-cello ensemble in a program featuring a commission by musician/DJ/composer Mason Bates, plus works by Piazzolla and Strauss.