Why are Bengalis dominant in the Indian filmfare award for best male singers?

Bengalis make up 8% of India, 

Yet 43.1% of the time a Bengali wins the best Indian Male Playback singer. 

For women it's not as impressive with Bengali women winning it 27.1% of the time, yet it's still way above their proportion to the population (8%). 

How come Bengalis are so dominant in this aspect? Is it the culture?

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