Justin Bieber and Metallica

Justin Bieber may be known as a pop singer who sang sweet songs. But in fact, Bieber was rock music enthusiasts, especially Metallica.

"I like rock music, I love Guns N Roses, Metallica and The Beatles. I like songs like Metallica's Fade to Black and One. It's a tense and emotional songs with their musical instruments and electric guitars roar," Bieber said, as quoted by Femalefirst.

Even so, Bieber still defends pop music and pop music he chose to continue his career. For him, pop music is also filled with talented young musicians.