Answer:
As a state in the USA, I am round on both sides and high in the middle. What am I?
What type of house weighs the least?
You bind me and I walk. You loosen me and I stop. What am I?
I was was before was was was.
I start new then become old. Start clean but be one dirty. I usually start big then become little.
The profession of Jimi Hendrix and Eric Clapton