If it pleases the court, we posit that despite the lack of traditionalists nowadays, the blues is still not a lost art. Exhibit A: the Black Keys sixth studio album, “Brothers.”

Here, the duo from Akron, Ohio take the lessons learned from their last album’s producer, Gnarls Barkley and Broken Bells maestro Danger Mouse, and expand their sonic palette to include everything from bass to harpsichord to choir to organs.

In this way, they manage to squeeze every incarnation of the genre throughout each of the album’s 15 tracks. We have the Gospel opener “Everlasting Light,” the psychedelic “I’m Not The One,” the shuffling “Howling For You,” the cover of Jerry Butler’s ballad “Never Gonna Give You Up,” the swamp-funk of “Sinister Kid” and the trippy Pink Floyd country of “These Days.” That’s all without mentioning the whistling single “Tighten Up” or its entertaining breakthough video. And when you have all of the above, who really needs to?

Guitarist Dan Auerbach still loves his pentatonic scales, which makes everything sound vaguely like a vintage kung-fu soundtrack, and his voice is getting more restrained and varied from falsetto on “The Only One” and “Everlasting Light” to his trademark tenor on songs like “Unknown Brother.” Meanwhile drummer Patrick Carney keeps playing around with arrhythmic patterns such as on the uneven waltz of “The Go Getter.”

That a two-piece blues band is able to keep things fresh and expand while retaining the staples of their sound is an impressive feat and proof that the blues is still alive and well. Just see one of their concerts, like this year’s set at Lollapalooza, and it will become clear that this case shall remain closed for quite some time.