And you thought she would be a one-crappy-hit wonder … wronnnnnnng! Rebecca Black, the singer behind the Internet sensation “Friday,” is back with a followup called, naturally, “Saturday.” So what makes “Saturday” different from “Friday”? Well, Rebecca is two years older, for one, which means she’s way more mature and got way more freedom. There’s frolicking on a beach and a party where everyone gets doused with a hose and lots and lots and lots of boys. Now, musically speaking, “Saturday” is easier on the ears than “Friday” — it still pretty much sucks, but it doesn’t suck super duper hard. Anyway, I wonder if Rebecca will continue her music career by releasing “Sunday” next. Mellowest day of the week … maybe that one will be a ballad.