"Randall delves deeply and engagingly, citing and expanding upon many historical precedents as support for his overarching thesis that yes, music can and should elicit worldwide progress. His in-depth accounts, in conjunction with his amicable voice and spread-out focus, make it a fascinating and crucial read for music fans, historians, and cultural activists alike. Sound System is ceaselessly fascinating and incredibly well researched, with a narrative voice that's simultaneously highly educated and humbly inviting. In a way, Randall writes like the hip history professor everyone wishes they had, and while his anecdotes regarding his own participations, as well as those of popular artists like Eric Clapton, Bob Dylan, and Joni Mitchell, are intriguing, it's the level of depth he goes into about much older and lesser known activists that truly makes the book a must-read for anyone interested in music, culture, and/or politics."– "PopMatters"