a love song from film, Ghulami

I often wonder why does one like what one likes. Why do I like certain song, certain film clip, a painting, a particular food , certain smell.... why? One can go into psychology of taste or into philosophy, into human behaviour...the choice is endless. But, that may kill the romance. so why to bother... The question will remain--why do we love?
While deleting certain files from my desktop, I suddenly found this clip. One of my all time favourite songs. This particular song clip is from a Bollywood from J.P.Dutta's debut film "Ghulami"( Slavery), 1985. The film was a good portrayal of rural north India, set in the backdrop of Rajasthan. http://www.imdb.com/title/tt0089201/usercomments

I do not know what attracts me in this song. Is it the music( Laxmikant Pyarelal), the lyrics(Gulzar), the mise en scene , Smita Patil( my favourite who died too early), MithunChakravarty's facial expression and subtle movements and last but not least a not so successful (yet powerful) actress Anita Raj. I can associate traits I like but...
In the song, it is a story of a road, or more precisely about a bus journey, a halt... a couple, a dancer, old dilapidated fort, an incomplete structure , a ruin standing in the desert, a sunset... kabhi kabhi shaam aise dhalti hai, jaise ghunghat utar raha hai
tumhaare seene se uthataa dhunyaa hamaare seene se gujar raha hai...
The film highlighted rural exploitation, caste and poverty. In such context, bus, road, love all become metaphors for resistence and escape. Escape in the form of migration was the dominant mode of resistance against local landlords harsh situation throughout pre-colonial period and even later on. But how does love and resistance meet each other?
As a form, this song can be broadly placed with lambi judai or lamhe's morni baagaan maan boli raat maan. this should not be in terms of the lyrical meaning structures but in terms of their regional flavour, a mixture of rajasthani folk along with mainstream Hindi bollywood music. In these songs, one finds a longing, in hindi it is 'hook'. This 'hook' stretches certain lines as if calling a beloved who is far. The distance sometime represents physical distance, physical absence of beloved quite often it is a metaphorical longing, it is a search of love, of proximity of closeness even within those sitting close by, standing side by side...wo aake pahalu main aise bethe, jaise shaam rangin ho gayi hai...
This is also available at youtube at
http://in.youtube.com/watch?v=ztSfGWhwiio