What is a Mummy's favorite type of music?

First in round, then square is bound, in triangle form is the last shape found.
What am I?

What is the next number?

1, 4, 1, 5, 9, 2, ?

A seed with three letters in my name. Take away two and I still sound the same. 
What am I?

I am six times longer than the Amazon, a fifth of my is dry and the rest is wet.
What am I?

What fruit can you use to sip water?