Apple has finally gotten Sony Music Group to sign on for iRadio, and not a moment too soon. Sony was the final piece of the three major record labels Apple needed for its yet-to-be-released music streaming service, which is expected to be announced Monday at WWDC (Apple's Worldwide Developers Conference). The timeline for labels signing up with Apple has been a rushed one, with Universal signing up in May, Warner Music only a few days ago, and Sony just now. 

It's been said that Sony was hesitant about signing on with Apple because the music label wanted more money than the deal they previously inked with iRadio's rival, Pandora. No word if they got what they wanted, but Apple was likely feeling the heat with their conference just around the corner.

WWDC will be hosted in San Francisco June 10 to 14, so stay tuned for the latest on some big developments for Apple next week.

[via AllThingsD]