After listening to the songs the whole afternoon while working..
ROCK
Song 1: It just bored me.
Song 2: I really like the intro but when the verse started, it's like it just came flat and empty. The chorus is okay but it's not really the song I'll keep listening to.
Song 3: The vocals are somehow interesting, although I don't think in a good way.

The song is something, I cannot really digest if I really like it or not. The melody and the song structure are really good, I am just somehow annoyed by the vocals. Overall, I think I like it and it'll grow on me if I continue listening to it for numerous times.
Song 4: I actually loved their album, and I love this song! Not really the first ones I'll play upon listening to the album but it's certainly a fine track and it's a really great entry for this round.
RnB:
Song 1: The intro screams RnB, but the song overall somehow leans more into pop. I love the vocals, and I know this song, although I have totally forgotten about it until hearing it in this game again.

Nice song with great vocals.
Song 2: I think this also swerves more into pop. I don't like it.
Song 3: Is this RnB too? Anyway, great song! Always loved this and kudos to the sender, this is a sure safe entry.
Song 4: Well, this stands out from the rest because it's the most RnB song to this round, IMO. I actually don't like the song so much but I live for that soulful voice. This deserves credit though for standing out in the genre.
POP:
Song 1: What song is this? It's a bop! I also love the vocals, kinda James Morrisson-like, and I seriously love that guy's vocals! Amazing choice!
Song 2: I love the soft and simple melody of the song throughout, but some lines are very repetitive for a pop ballad like this. I love the message it conveys as well. Not sure how I'll rank this but it's definitely a nice choice.
Song 3: I have this album, and this one is really good. I may have preferred other options like Good Place or Who I Am but this one's great as well. I seriously wish he can have new music out. He's very talented.
Song 4: Safe entry, don't like it.
I based my rankings on which songs really lean toward the genres they have been submitted, replay value of the songs, and lyrics (

), Haha. Good luck guys! I must say, this is a good round!