Answer to Question 1
The performance begins with alapana, an improvised section in free rhythm for veena alone and an introduction to the raga used in the composition.
Answer to Question 2
A mridangam is a double-headed, barrel-shaped drum. Both of its drumheads are made from multiple layers of leather with the outer layers cut with a circular hole in the middle. One head is tuned, the lower (untuned) head has a blob of wheat paste applied to its center to give it a booming sound. The use of the fingers as drum sticks allows the drummer to play with incredible speed.
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