Trilogy is the third studio album by the English progressive rock band Emerson, Lake & Palmer, released in 1972. The front cover designed by Hipgnosis depicts Emerson, Lake, and Palmer attached at the shoulders, while the interior of the original gatefold sleeve features a photomontage showing multiple images of the band in Epping Forest carpeted with autumn leaves. - Trilogy increased ELP's worldwide popularity, and included "Hoedown", an arrangement of the Aaron Copland composition, which was one of their most popular songs when performing live.