Music plays a hugely important role in our emotional, intellectual, and even physical lives. It impacts the ways we work, relax, behave, and feel. It can make us smile or cry, it helps us bond with the people around us, and it even has the power to alleviate a range of medical conditions. The songs you love (and hate, and even the ones you feel pretty neutral about) don't just make up the soundtrack to your life--they actually help to shape it....