The black keys on a piano are known as sharps, and that's exactly what the Black Keys were at Avalon on Thursday night.
The Akron, Ohio, duo blazed through a set that celebrated several genres without giving short shrift to any of them.
What's most satisfying about the lo-fi yet full-bodied sound that guitarist-singer Dan Auerbach and drummer Patrick Carney create is how much subtext can come from such a seemingly small surface area.
The duo is nominally a blues-rock act in the vein of the White Stripes, Zeppelin, Hendrix, and any number of classic blues artists, but Thursday's show revealed the way in which the college rock faves soup up their sound to get the motor purring.