I'll list my top 5 favorite.
#1. Sell Your Soul | At first I didn't want to listen to this song, simply because the title is "Sell Your Soul", and I'm a Christian, but anyway, it's my most favorite song by Hollywood Undead ever.
#2. Undead | The song is just kickass. Nothing else to say about it.

#3. The Diary | This song means a lot to me, since I have a friend who's life is similar. I showed him the song, and instantly he loved it.
#4. Paradise Lost | I love this song, simply because of the heavy guitar and rhythm. Also, the screaming in it is pretty nice, too. Da Kurlzz is a really good screamer.
#5. This Love, This Hate | This song is really cheerful, and it makes me feel good when I listen to it.
I have every one of their songs on my iPod, and on my coputer. I listen to them 24/7.

Also:
From left to right, I'll name the members.
Far left - Da Kurlzz (Does the screaming and the live percussion)
Second from left - Charlie Scene (The most gangster-like member)
Third from left - Johnny 3 Tears (The most angry-like member)
Fourth from left - Deuce (A.K.A. Tha Producer | The producer and founder of the group)
Fifth from left - J-Dog (Co-founder)
Sixth from left - Funny Man (The deep voice in the songs. He's a baritone)
They're all Caucasian, except for Funny Man and Charlie Scene. Charlie Scene is Black, and Funny Man is part Hispanic.
But yeah, just answering anyone's question about who each one is.
Uh, Charlie Scene is not back lol, he's white, and The Funny Man (aka King Kong) is only part mexican.