Listen to Koi Aap Sa online. Koi Aap Sa is a Hindi language song and is sung by Himesh Reshammiya, Sonu Nigam, and Alka Yagnik. Koi Aap Sa, from the album Koi Aap Sa, was released in the year 2005. The duration of the song is 5:37. Download Hindi songs online from JioSaavn.