David Farland’s Drawing on the Power of Resonance in Writing points out that people talk about resonance without telling what that is. Farland first defines resonance. Next, he demonstrates how works can resonate with art, titles, names, quotations, movies, operas, other literature, settings, motifs, characters, real people, emotions, common or universal experiences, social conditions, and within a work itself. J.R.R. Tolkien’s Lord of the Rings becomes his case study, discussing how Tolkien draws upon mythology and such to resonate.
If you’d like to read more of his writing advice, he has an entire blog of such on his website.