Listen to Ab To Muskuraiye Zara online. Ab To Muskuraiye Zara is a Hindi language song and is sung by Ranu Mukherjee and Hemant Kumar. Ab To Muskuraiye Zara, from the album Do Dooni Chaar, was released in the year 1968. The duration of the song is 3:14. Download Hindi songs online from JioSaavn.