Lewis & Short

mĕlōdus, a, um, adj., = μελῳδός, pleasantly singing, melodious (post-class.): virgines, Aus. Prof. 15, 8: carmen, Prud. Cath. 9, 2.
Hence, subst.: mĕlōda, ae, f., a melody: lyricae melodae, Ven. Carm. 9, 7, 13.