The White Stripes and The Black Keys are collaborating on a new project.

They're going to call it Piano.

That joke has been around for a long time.  Their names are not the only way people have connected the two bands.  Since the release of The Black Keys' 2002 debut album, The Big Come Up, fans and critics have compared the two bands.  Around that time, The White Stripes were starting to get a lot of attention.

As Esquire pointed out, both bands are guitar/drum duos from the midwest.  They have both worked with producer Danger Mouse, and done notable producing of their own.  Also, The Black Keys and Jack White both live in Nashville.

That last fact is important.

White apparently once blocked Black Keys front-man Dan Auerbach from entering his Nashville studio.  When asked about the Keys, Jack White told Rolling Stone, "I'm a lot more to do with Jay-Z than the Black Keys."

That's all old news.

But, a piece of new information has us wondering.  Jack White's ex-wife Karen Elson filed a restraining order against him.  In the restraining order, she notes White's anger at rival musicians who "ripped off" his music.  In one incident, White allegedly wanted Elson to remove their children from a class that also included the child of a "rival musician."  In a separate argument, White allegedly screamed at Elson for attending the wedding of a rival musician.  In both cases, White's issue was that the musicians "ripped off" his music.

He's talking about The Black Keys.  In emails obtained by TMZ, White said, "My concern with Auerbach is because I don't want the kids involved in any of that crap ... That's a possible twelve f***ing years I'm going to have to be sitting in kids chairs next to that a**hole with other people trying to lump us in together...he gets yet another free reign to follow me around and copy me."

Twenty years ago, an eccentric front-man of a band criticized another band from his his town.  Those two bands received a lot of attentions and comparions, also.  Rock feuds aren't new.