Rock music is a broad popular music that started as rock and roll in the USA during the 50's and became more evolved during the 60's.
Yes that is very true
With regards musically rock has centered on the electric guitar , mostly as part of a rock group with a electric bass , drums and sometimes other players as well.
Sounds like you have done your research. When I think about all the different rock songs I enjoy listening to, it always revolves around the guitar
YEs . A rock song henerally is based with a 4/4/ time signature using the verse chorus but genre has become different over time.
Just curious, are you involved in the music business?
pop music lyrcs are the same as romatic love and rock songs generally have those lyrics but can also adress a wide variety of other themes that are frequently political or social.