It's the unmistakable falsetto leads, lilting harmonies and deep backing vocals set to a street corner rhythm that created the unmistakable sounds of songs like the 1959 Little Anthony and the Imperials hit “Tears On My Pillow” or the 1963 Crystals chart-topper “Da Doo Ron Ron.” Fresh from their appearance in Brent Wilson’s new documentary “Streetlight Haronies” on the history of doo-wop, La La Brooks of The Crystals and Sammy Strain of Little Anthony and the Imperials join the director for a discussion of how the genre influenced their legendary careers in this installment of Leonard Lopate at Large on WBAI.