"Why" I like
Pray by Justin Bieber. There is no such thing as "proving" it's a great song. The best I can do is describe.
Now sometimes, after listening to Bieber too much, an adult singer is a bit of a relief. He does sing largely like a teenager on this record, in the midst of his voice change too, and some people like it better when brilliant young singers can "sing like an adult." But at most other times, I like and admire the authentic, soulful teenage sound of his voice, and how it is able to rise above itself to this level of
poignant humanitarianism.
If you haven't listened to Pray, as I think most who have commented here have not, you really can't say anything correctly about Bieber. I like his most popular (and most hated) song "Baby," partly because it reminds me of my old Motown and Beatles favorites like Baby Love and She Loves You, but it's nowhere near as good as those, and it is an easy target for Bieber skeptics and haters for its bubblegum qualities. But I can say that I have sampled a number of Bieber songs by now, and
I like almost all of them. Contrast that with Rihanna, John Legend, Miley Cyrus, Chris
Pray was primarily written by Bieber, but he had a lot of help from "The Messengers," a writer/producer duo that figure in others of his best songs (e.g. Mistletoe), and in Next 2 You by Chris Brown feat. Bieber.