The shift toward singles has been happening for years. Music consumers have shorter attention spans than ever before, and one good single early in an artist's career can establish a clear path to a successful career. Just the same, a few early flops can turn listeners off—if they hear your music and they aren't impressed, you most likely aren't going to get a second and third chance. That's why the debut single is so important. You only get one chance to make a good first impression, and these pop artists nailed it. Here's 10 artists we're excited about based on the strength of a spectacular debut single.