This Hirishikesh Mukherjee movie was brilliant in all aspects.
It had wonderful performances by the lead actors and the character artists - the mellow Jaya Bachchan with her all-expressive-eyes (gosh! just watch piya bina, looTe koi man ka nagar, tere mere milan..and you'll know what I am telling), and Amitabh Bachchan's perfect MCP act! (how I hated him in the movie ;-))
What makes it even more special are the songs. I just love the way the songs transition with the tone of the movie. Romantic (teri bindiya re), peaceful (nadiya kinare), melancholic (ab to hain tumse, tere mere milan), sad (piya bina) and fun (meet na mila re, looTe koi man ka nagar) too! SD Burman's melody and Lata Mangeshkar's rendition creates the magic that makes Hindi cinema (no, not bollywood) what it is.
Go ahead, listen to the songs. You will not be disappointed. Oh! Watch the movie too! :-)