By Ilan Nassimi of Fueled Written by the editors at Fueled , an agency thatmakes stunning iPhone apps . You’ve got talent, great ideas, and plenty of ambition. You know that it’s just a matter of time before you’re entrepreneurial spark catches fire and ignites an explosion of consumer interest. Still, even the best young entrepreneurs need to keep their spirits up when things are challenging. These songs will keep you going as you build on your concepts and develop your business. 1. Billionaire (Travie McCoy) This song captures the heart of the entrepreneur’s dream. McCoy sings about everything he would do if he were a billionaire, about how that fantasy is always lurking, always driving him “every time I close my eyes.” It’s a great inspirational song because it encourages you to keep a vision of what you want your life to be no matter what happens, and to set goals for what you’d do with your success. 2. Mean (Taylor Swift) When you’re on your journey to the business big lea...