On June 6, the Broadway Sings concert series returns to the Highline Ballroom. The Best of Broadway Sings will feature Laura Michelle Kelly, Christina Sajous, Katie Boeck, Jay Armstrong Johnson and many more performing hits from pop superstars with orchestrations and arrangements by music director Joshua Stephen Kartes. In this exclusive rehearsal room preview, series producer and founder Corey Mach runs through Sara Bareilles’ “Between the Lines.” For details and tickets, visit broadwaysingsconcert.com.