The best replacement for black keys is big boi.

The best alternatives to black keys are rated as following:
★★★★★  big boi
★★★★★  white stripes
★★★  vampire weekend
★★★  vampire weekend colbert
★★  arctic monkeys
★★  vampire weekend colbert report
★★  white keys
★★  nickelback
★★  jack white
★  big boy
★  bieber
  arcade fire
  red keys
  kings of leon

Your alternative for black keys is not listed? Suggest!
Speaking about black keys, one probably shouldn't forget about rza.

Other search terms related to black keys and their ratings are:
★★★★★ rza
★★★★ johnny depp
★★ arctic monkeys
★★ flaming lips
★ dr john
★ dr. john
★ big boi
★ tegan and sara
★ jack white
★ danger mouse
john depp
You have in mind a companion for black keys and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of black keys in all years. Click on graph for more.
black keys
big boi
white stripes