Rock music came into existence in the rock and roll era of the 1950s. Rock music has its focus mainly on guitars, drums and heavy vocals. However, use of piano, synthesizer, saxophone, flute, mandolin and sitar has also been witnessed in the modern rock era. These instruments are mainly used to create a deeper impact. Elvis Presley and The Beatles are considered to be the pioneers of rock music. Over the years, rock music has diversified into various genres like hard rock, metal rock, progressive rock etc.