The album is often considered the second in a trio of folk rock albums released by the band at the end of the 1970s, alongside Songs from the Wood (1977) and Stormwatch (1979). In contrast to the British folklore-inspired lyrical content found on Songs from the Wood, Heavy Horses adopts a more realist and earthly perspective of country living - the album and its title track are dedicated to the "indigenous working ponies and horses of Great Britain". Musically, the album sees the band continuing the combination of folk and progressive rock found on Songs from the Wood, although with an overall darker and more sober sound fitting the changed lyrical content.
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