A bunch of crap has happened in 2015 and the start of 2016. To start off, zayn left, second Louis announced that he was going to be a dad, next they announced that they were going on break until 2017, and lastly Louis is now a dad. Life Happened Hard In 1-2 Years.
Yeah. It's when somebody sings the song in there style, either because they like it, or they thought that the orignal wasn't as good, so they wanted to spice it up a bit.