Conversation so far:
which type of music is popularized by bob marley
Roots reggae usually refers to the most recognizable kind of reggae, popularized internationally by artists like Bob Marley and Peter Tosh.
what is roots reggae characterized by
Roots reggae is a subgenre of reggae that deals with the everyday lives and aspirations of Africans and those in the African Diaspora.

Question: what are some lyrical themes
Self-contained rewrite: what are some lyrical themes in roots reggae