In 1994, the music critic Simon Reynolds coined a new term: post-rock. It was an attempt to give a narrative to music that used the tools of rock but did something utterly different with it, broadening its scope by fusing elements of punk, dub, electronic music, minimalism, and more into something wholly new.

Post-rock is an anti-genre, impossible to fence in. Elevating texture over riff and ambiance over traditional rock hierarchies, its exponents used ideas of space and deconstruction to create music of enormous power. From Slint to Talk Talk, Bark Psychosis to Godspeed You! Black Emperor, Tortoise to Fridge, Mogwai to Sigur Ros, the pioneers of post-rock are unified by an open-minded ambition that has proven hugely influential on everything from mainstream rock records to Hollywood soundtracks and beyond.

'The doors were blown open for me on everything, ' says Kieran Hebden (Fridge/Four Tet). 'I didn't think in terms of genre almost ever again.'

Drawing on dozens of new interviews and packed full of stories never before told, FEARLESS explores how the strands of post-rock entwined, frayed, and created one of the most diverse bodies of music ever to huddle under one name.

In the late 60s and early 70s the inherent weirdness of folk met switched-on psychedelic rock and gave birth to new, strange forms of acoustic-based avant-garde music. Artists on both sides of the Atlantic, including The Incredible String Band, Vashti Bunyan, Pearls Before Swine and Comus, combined sweet melancholy and modal melody with shape-shifting experimentation to create sounds of unsettling oddness that sometimes go under the name acid or psych folk. A few of these artists--notably the String Band, who actually made it to Woodstock--achieved mainstream success, while others remained resolutely entrenched underground. But by the mid-70s even the bigger artists found sales dwindling, and this peculiar hybrid musical genre fell profoundly out of favour. For 30 years it languished in obscurity, apparently beyond the reaches of cultural reassessment, until, in the mid-2000s a new generation of artists collectively tagged 'New Weird America' and spearheaded by Devendra Banhart, Espers and Joanna Newsom rediscovered acid and psych folk, revered it and from it, created something new. Thanks partly to this new movement, many original acid and psych folk artists have re-emerged. Seasons They Change tells the story of the birth, death and resurrection of acid and psych folk. It explores the careers of the original wave of artists and their contemporary equivalents.