Commentators and historians frequently cite "Pet Sounds" as a concept album. Academic Carys Wyn Jones attributes this to the album's "uniform excellence" rather than a lyrical theme or musical motif. Brian described "Pet Sounds" as an "interpretation" of Phil Spector's Wall of Sound production technique. He stated: "If you take the "Pet Sounds" album as a collection of art pieces, each designed to stand alone, yet which belong together, you'll see what I was aiming at. ... It wasn't really a "song" concept album, or "lyrically" a concept album; it was really a "production" concept album."