"Kasto Mazza" is a song from Bollywood

Bollywood

Bollywood is the informal term popularly used for the Hindi-language film industry based in Mumbai , Maharashtra, India. The term is often incorrectly used to refer to the whole of Indian cinema; it is only a part of the total Indian film industry, which includes other production centers producing...

 movie Parineeta

Parineeta (2005 film)

Parineeta is a Bollywood musical film adaptation of the 1914 Bengali novella, Parineeta by Sarat Chandra Chattopadhyay. Directed by debutant Pradeep Sarkar, the film was based upon a screenplay by the film's producer, Vidhu Vinod Chopra. The film featured Vidya Balan, Saif Ali Khan and Sanjay Dutt...

 directed by Pradeep Sarkar

Pradeep Sarkar

Pradeep Sakar is a writer and director who works in the Bollywood industry.He began his career with Vinod Chopra Productions, the production company of acclaimed director Vidhu Vinod Chopra....

.

About the song

This song was composed by Swanand Kirkire

Swanand Kirkire

Swanand Kirkire is an Indian lyricist, playback singer, writer, also a television serial writer, assistant director, dialogue writer, both in television and Hindi films.Kirkire won the National Film Award for Best Lyrics twice...

 and sung by Sonu Nigam

Sonu Nigam

Sonu Nigam is an Indian playback singer whose songs have been featured in numerous Hindi movies, as well as films in Assamese, Punjabi, Bengali, Marathi and Kannada language. He has also released numerous Indi-pop albums and acted in a few Hindi feature films...

 , Shreya Ghoshal and voices of children on a train.This song features Shekhar (Saif Ali Khan

Saif Ali Khan

Saif Ali Khan is an Indian actor known for his work in Bollywood films. He is the son of the late former Nawab of Pataudi, Mansoor Ali Khan Pataudi, and actress Sharmila Tagore. He has two sisters: Saba Ali Khan and actress Soha Ali Khan....

) travel by train and miss his beloved Lolita (Vidya Balan

Vidya Balan

Vidya Balan is an Indian actress, who appears in Hindi films. After graduating with a degree in sociology, she started her career starring in music videos, television shows and commercials, before appearing in feature films....

).

Music video

The song is picturised on a train by Shekhar (Saif Ali Khan) miss his love and dreams about her.The song features the tune of train

Train

A train is a connected series of vehicles for rail transport that move along a track to transport cargo or passengers from one place to another place. The track usually consists of two rails, but might also be a monorail or maglev guideway.Propulsion for the train is provided by a separate...

 and children singing a local Nepali

Nepali language

Nepali or Nepalese is a language in the Indo-Aryan branch of the Indo-European language family.It is the official language and de facto lingua franca of Nepal and is also spoken in Bhutan, parts of India and parts of Myanmar...

 folk song.

Trivia

• In this song Saif Ali Khan
  Saif Ali Khan
  Saif Ali Khan is an Indian actor known for his work in Bollywood films. He is the son of the late former Nawab of Pataudi, Mansoor Ali Khan Pataudi, and actress Sharmila Tagore. He has two sisters: Saba Ali Khan and actress Soha Ali Khan....
  
   rides on the same train Sharmila Tagore
  Sharmila Tagore
  Sharmila Tagore is an Indian film actress. She has won National Film Awards and Filmfare Awards for her performances.She has led the Indian Film Censor Board from October 2004 till March 2011...
  
  , his mother, rides on in Aradhana. http://in.rediff.com/movies/2004/dec/23saif.htm.