OK. i guess the title says it all. you just need to give your REAL opinion about the song that has been posted above you, the opinion could be good or bad. another rule is that the song that you've commented shuld be one of those song that you HAVE had listened, so that you can give a fair opinion about it, and that we wont get any " I havent heard of it!" phrase , after gave an opinion you should give another new song.
Though it's not one of her best, I like the song. It's not her most memorable, but then I suppose that doesn't really matter, as it's only for a GH album anyway, right?
Another generic, boring R&B song, and forgettable artist. A song that'll be forgotten by January 2010. (Ester Dean)
Really catchy song, and good beat. (Jordin Sparks)
OMG, i hate to admit, but this song turn me into a shakira stan, i want to declare myself as a stan here, but nooo.... i dont like pedro, and he's a shakira stan, so i will kepp it for my self
, after gave an opinion you should give another new song. 
"Hot N Cold" is one of Katy's best songs 