This paper focuses on intermedial relations between music and literature of European Modernism and early Avant-garde, and monitors the impact of music on literary texts, literature as a whole, and the essentially literary medium - the book. "Musical work", in this case, refers to Richard Wagner's music dramas and theoretical texts that outlined Wagner's artistic-aesthetic concept of Gesamtkunstwerk as a total work of art uniting all the arts. This paper follows the meta-aesthetic line of intimate, synaestheticly oriented intracompositional literary Gesamtkunstwerk in selected literary texts by Charles Baudelaire, Stéphane Mallarmé, Marcel Proust, and in The Blaue Reiter Almanac. It reveals the essence of analogies between music and literature, various manifestations of musicalization, and their significance for literary works and literature as a whole. It additionally emphasizes that the selected texts have also been influenced by already "literarized" music, as well as by esoteric teachings on speculative music, and highlights the gradual disintegration of boundaries between the arts, which led to their abstraction.