Within the overarching concept of Howard's Middle Earth music (including the music of "the Hobbit" films), the score has occasionally adopted diegetic music (by "the Elvish Impersonators") like the Misty Mountains song, as well as leaked into diegetic music (like "Valley of Imladris") and even into sound effects, with a war horn calling out the Erebor theme. Hence, these compositions can be viewed in much the same way that other composers will use phrases from Dies Irae as themes within their scores.