The Song Sommelier, a website dedicated to the curating of playlists recently published both a now and then playlist of protest music. Along with the two playlists is an informative write-up which contained thoughts on the socially conscious music represented by the 2019 Mercury Prize nominees.
Protest Music Now
Protest Music Then
For more protest music, feel free to check out the following playlists.
Protest Music of 2019 (is regularly being updated)
Protest Songs of 2018