Listen to Aap Kyon Udaas Hain online. Aap Kyon Udaas Hain is a Hindi language song and is sung by Asha Bhosle. Aap Kyon Udaas Hain, from the album Log Kya Kahenge, was released in the year 1983. The duration of the song is 3:13. Download Hindi songs online from JioSaavn.