Sor was even part of traveling military bands that would play protest music on the streets.
It was protest music in a way nobody had ever thought about before.
Israel's protest music has often become associated with different political factions.
The most famous source of Russian protest music in the 20th century has come those known locally as bards.
The book is an astounding history of protest music, told through 33 momentous songs.
This is protest music at its most spectacular - sound as action.
It has been described as "Australia's great lost classic album of black protest music".
Listeners sometimes wonder why hip-hop doesn't produce more fiery protest music.
He said the group's raps "shared a common thread with protest music."
Besides, these kids were skeptical of the power of protest music.
