Brazilian country singer who is known for albums like Acústico 20 anos and Tudo Tem um Porquê. He has put out songs such as "Que Dá Vontade Dá" and "Mete Sua Boca".
One of his earliest albums was the 1994 album Guilherme & Santiago - Vol. 1.
He has accumulated over 190,000 followers on his guilhermeguisant Instagram account.
He posted a photo with his son to his Instagram account in August 2017.
He shares a birthday with fellow singer Keyshia Cole.