I don't know much about either, I've only heard little bits.
A) A boy and a girl singing in harmony, kind of an upbeat indie song... "I surronded you, yeah I surronded you, baby please... [blah blah] don't agree..." - That's what I interpreted at least. I googled the words, didn't come up with anything.
b) A guy singing "The world is really gonna love youuu, the world is really gonna love youuu," - Again that is what I heard/remember, and I googled to no avail.