Mohammad Rafi's "Aaj Mausam Bada Beimaan Hai" came to my attention through the Monsoon Wedding soundtrack, and I listened to it for years before I bothered to seek out the original video. I'm so glad I finally did though, becuase, well, LOOK at it! Dharmendra! Plaid pants! Big hair! It's 70s eye candy for sure. My only quibble is that the film version leaves out my favorite verse:
Kya hua hai, hua kuch nahi hai
Baat kya hai pataa kuch nahi hai
Mujhse koi kataa ho gaye to
Isme mere kataa kuch nahi hai
Kuubasuurat hai tuu rut javaan hai...
I dare you not to have this beautiful tune in your head all day.