Creativity, three song snippets and winding up at the start

Where do you find inspiration? Do you work on more than one project at a time? How long does it take to go from idea to a finished work? What is your least favorite part of the process? What is your favorite part? What do you do when you’re stuck? How do you know when a work is finished? Do you have any habits you use while being creative? Any places you find particularly creative? What tools do you use? Do you work alone or with others? Is the process the same every time?