A Bollywood actress singing in Mughal E Azam
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100 years of Indian cinema: Bollywood's unique song style

2 May 2013 Last updated at 19:01 BST

Bollywood songs are thought to be derived from various regional song types and have not changed much since the 1930s.

The high pitch of the female singing voice is another aspect which makes them so distinct.

Clips from Mughal E Azam.