Heavy Horses is the eleventh studio album by Jethro Tull, released on 10 April 1978. It is considered the second album in a trilogy of folk-rock albums by Jethro Tull, although folk music's influence is evident on a great number of Jethro Tull releases. The album abandons much of the folk lyrical content typical of the previous studio album, Songs from the Wood (1977), in exchange for a more realist perspective on the changing world. Likewise, the band sound is harder and tighter. The third album in the folk-rock trilogy is Stormwatch (1979).
This album was the last studio album to feature John Glascock playing bass on all tracks.
Contemporary review of Rolling Stone give a positive overview, calling the instrumental arrangements lavish and stating that Heavy Horses and the folk genre, as a follow up to Songs From the Wood suite Jethro Tull perfectly.
AllMusic calls Heavy Horses one of the prettiest records of the band, praising both Martin Barre and John Glascock playings as Robin Black engineering and the special participation of Curved Air's Darryl Way.