There are some things that don’t need to be overcomplicated, and a Black Keys album is one of them. For more than twenty years, childhood friends Dan Auerbach and Patrick Carney have come together in settings ranging from musty midwestern cement basements to expensive Hollywood multitrack facilities to the kind of tasty custom-built space where their remarkable new album, Dropout Boogie, was recorded, and there has been one constant: When these two musicians get in a room together with no distractions besides their instruments, the songs instantly emerge.