Answer:
small land in water.
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
Drop me and the world will shatter. You can always find me where you empty your bladder. What am I?
You find me behind the stars; or in a sixth seventh or third. It takes something round a computer and me to make pie. I am bigger than anything you can think of.
I am owned by Old McDonald.
The profession of Jimi Hendrix and Eric Clapton