Tony Award nominees Stephanie J. Block and Andrew Rannells will take the stage with the New York Pops on March 21 in On Broadway, a celebration of Broadway’s most unforgettable hits, both past and present. The program will feature selections from West Side Story, Carousel, Ragtime, Wicked, and more. Pops music director Steven Reineke will conduct the orchestra featuring some 80 musicians. Here, Playbill took a peek at rehearsal as Block and Rannells each ran though a solo number then joined together for a Sunday in the Park with George duet that both had always wanted to perform. For tickets and info, visit www.newyorkpops.org.