The notion of The Black Keys as some kind of neo-primitive blues machine risen from the swamp to bring you what rock was supposed to be has always been a little overstated: Like The White Stripes, they’ve always been highly style-conscious, not to mention more occupied with simplicity in concept than in practice—they work at it. Dropout Boogie feels of a piece with 2019’s “Let’s Rock”: catchy, concise, stripped down but polished, with references to glam (“Wild Child”), psychedelia (“How Long”), and post-Stones blues (the Billy Gibbons co-write “Good Love”). With 20 years as a band behind them, they have their story and they’re sticking to it. And the more sophisticated they get, the easier they make it sound.