Follow American Routes this week to the City of Brotherly Love, as we hang out on the musical street corners with some of Philadelphia’s finest, including bobby-soxer idol Bobby Rydell, hip-hop drummer and city champion Questlove of the Roots, and the city’s mayor, Michael Nutter, who can also claim fame as a disco DJ. We’ll visit famous operatic cafes and sit in with a neighborhood jazz organ trio. Plus catch a choir rehearsal at one of the city’s historic churches and a conversation with a mother-daughter klezmer duo. And musical postcards from artists who call Philly their hometown.