Sony Music bigwigs are “freaking out” that details of their hefty salaries could be leaked next after hackers pilfered 100 terabytes of data from Sony servers and successfully killed the movie division’s “The Interview.”

Sources tell The New York Post that all high-level correspondence on music deals is being done by fax these days. They say a main fear of the music moguls would be their salaries being made public — as well as other sensitive information about their artists, including Barbra Streisand, Beyoncé, Adele and Bruce Springsteen — before Sony reports annual results in April.

“The music people are panicking,” exclaimed a source. “There are people in their music division who are three or four of the highest-paid executives in all of Sony.”

The source said top music bosses make much more than Sony movie head Amy Pascal, whose $3 million contract ends in April. Insiders have said Pascal won’t step down, but her future’s unclear after the contract ends.

Seasoned industry veterans Doug Morris (Sony Music CEO) and Marty Bandier (chairman and CEO of Sony/ATV Music Publishing), who are both septuagenarians, have contracts due to expire at the end of 2015, and decisions on whether to renew them would be made early next year, a source said.

Sony Music is home to acts including rapper Bobby Shmurda, David Bowie, Coldplay, Rita Ora, Garth Brooks and Meghan Trainor.

A Sony rep declined to comment.

Click here to read more in The New York Post.