I wud get insane if I don't hum or sing even during my busiest of hours. A song which I hummed y'day evening and luv to to hum it always whenever I am stressed with work. Here it is -

Woh jab yaad aaye, bohut yaad aaye
Gham-e-zindagi ke andhere mein humne
Charag-e-Mohabbat jalaye bujhaye,
Woh jab yaad aaye, bohut yaad aaye

Aahatein jaag utheen, raaste hans diye
Tham ker dil uthe, hum kisike liye
Kai baar aisa bhi dhokha huya hai
Chale aa rahe hain, woh nazarein jhukaye
Woh jab yaad aaye, bohut yaad aaye !!

Dil sulagane laga, ashq behne lage
Jaane kya kya hamein log kehne lage
Maghar rote rote bhi, hansee aa gayee hai
Khayalon mein aa ke, woh jab muskuraye
Woh jab yaad aaye, bohut yaad aaye
Gham-e-zindagi ke andhere mein humne
Charag-e-Mohabbat jalaye bujhaye
Woh jab yaad aaye, bohut yaad aaye !!