Libraries or sounds are created by??

Hi all, I am going to put a couple of songs, but rather remixes of Willy William, that caught my attention, the fact is that libraries would want to know if the guy or they are created.

[soundcloud:ay6mhgvd]https://soundcloud.com/willywilliam/alicia-keys-she-on-fire-willy[/soundcloud:ay6mhgvd]

In this first, is more reggetonera, but it is not the first song or remix I hear those same sounds.

[soundcloud:ay6mhgvd]https://soundcloud.com/willywilliam/adele-set-fire-to-the-rain[/soundcloud:ay6mhgvd]

This remix what I like most is the electric guitar that sounds below, and I think that I’ve heard other remixes, hence ask if libraries and you know they are called.

Greetings and thanks …