Amar (1954)
Two are from one of my favourite songs of all time - 'Na Shikwa Hai Koi'
This, in my opinion (Mughal-E-Azam being in it's own league entirely so lets put that aside), is Madhubala AND Dilip Kumar's best performances to date. They are acting their best as well as looking their best (with Madhubala a mere 21 years old here!)
The theme of this movie wasn't well received in those days, but the way Mehboob Khan has woven such intricate detail into all songs and dialogues to fit the script and story line as well as possible so that the message is put across in a VERY powerful way; such attention to detail - if only all film makers in the industry are able to give out such masterpieces in today's Bollywood. (Unlikely!)