Music critics were not kind to teenager Rebecca Black last year when the music video for her song "Friday" garnered millions of hits on YouTube: Rolling Stone ridiculed the video's "sub-par production values, grating hooks and extraordinarily stupid lyrics," while a host of others questioned whether the tune was possibly "the worst pop song of all time." But possibly the harshest criticism Black has received to date may be this week's comparisons to Double Take, a teen pop duo whose music video...