1940s - The closest precursor to rock is R&B.
1950s - Rock and roll explodes in popularity with Bill Haley, Chuck Berry and Elvis.
1960s - The British Invasion redefines rock, which blossoms into several subgenres.
1970s - Heavy metal emerges while arena rock dominates the rock scene.
1980s - Rock concerts become frequent fundraisers for social causes.
1990s - Alternative music from Seattle helps move rock in a new direction.
2000s - Rock fans explore to internet for indie music as an alternative to the mainstream.
2010s - Rock remains the best selling genre for album sales, yet rarely appears on pop charts.