Rock music known and become popular about 1940 and 1950 with his root from rockabilli and rock n roll. Almost people know whose rock star in that time, Elvis Prasley. Rock Which evolved from blues, country music and other influences. According to All Music Guide, "In its purest form, Rock & Roll has three chords, a strong, insistent back beat, and a catchy melody.

Well, rock music usually enjoyed by people who loves adventure, challenge, and experiment. Listen to the rock music also can gain our adrenaline, because the melody and rhytim which plays on it make adrenaline hormon in our body explode.
So, keep on rockin dude!!