Pressure Drop chronicles reggae's most tumultuous and influential decade. Beginning in 1970 and unfolding across the world, reggae flourished against a backdrop of political upheaval, gang warfare, Black Nationalism, racial and class discrimination and grinding poverty.

The music that developed as rocksteady and early reggae gave birth to deejays, dub, rockers, lovers rock, early dancehall and 2 Tone was by turns brutal and revelatory.

Including an extensive analysis of the decade's major singles and albums, Pressure Drop includes eyewitness accounts and experiences of the decade from the likes of Burning Spear, Chris Blackwell, Gregory Isaacs, Bunny Wailer, Jimmy Cliff, Black Uhuru, U-Roy, Lee 'Scratch' Perry, Augustus Pablo, Toots and the Maytals, Desmond Dekker, Sly & Robbie, Dennis Bovell, Don Letts and members of the Specials, as well as first-hand anecdotes of Bob Marley and Peter Tosh.