Right now, the only beautiful thing in my life is listening to the slower version of Sarfaroshi ki Tamanna from The Legend of Bhagat Singh. Sonu Nigam also sang the faster version that is gung-ho, combative and spirited. By contrast, the slower version appears (IIRC) during the hunger strike that Bhagat Singh & his comrades have launched in jail. It is in a sad tone, but it still carries the spark of defiance in it. But towards the end of this long song (almost 7 minutes), the tempo picks up, the mood changes to one of hope, that the struggle will be carried on by others in the years to come. These words continue to ring on:

khushboo banke mehka karenge hum lehlahati har faslo.n mei.n
saa.ns banke hum gungunayenge aanewali har naslo.n mei.n
snip
sarfaroshi ki tamanna ab hamaare dil mei.n hai
dekhna hai zor kitna bazu-ae-kaatil mei.n hai
waqt aane pe bataa denge tujhe ae aasmaa.n
kya batayei.n hum junoon-ae-shokh kis manzil mei.n hai
(some of the transliterations are obviously wrong, so correct me!)