One thing's for sure, it didn't just arrive with Bill Haley and the Comets 'Rock around the Clock'.
The roots of rock can be found in the Mississippi delta region of America with the birth of the blues. It's really worth understanding how this music evolved and the key players as you work to develop your own playing. As Confucius says 'Study the past if you would define the future'.
I've recently been reading the book, 'Delta Blues' by Ted Gioia and recommend it as a well written history of the blues bringing to life the deep passion of the men and women who made the music. From the plantations, prisons and juke joints of the south and the music of Charlie Patton, Son House and Robert Johnson through to the migration north and the electric blues of Chicago featuring expats Muddy Waters and BB King among many others. It's a great story well told and helps us understand the music we love to listen to.
While on this subject "The History of Jazz" is another great title by the same author written with the same insight and passion.
If you really love music and love to play then you should have a good understanding of what went before, all the great songwriters and players who stand the test of time do.