Apple's signing of Sony was first reported on Friday by Peter Kafka of AllThingsD, who cited an unnamed person familiar with negotiations between the two companies. The alleged agreement is further evidence that Apple is gearing up to unveil its rumored "iRadio" service at next week's Worldwide Developers Conference.
Details of the deal come just days after Apple was also said to have successfully courted Warner Music Group. Previously, Apple had already agreed to terms with Universal Music Group, rounding out the big three labels.
For months, reports have claimed that stalled negotiations with Sony in particular have been holding up Apple's debut of "iRadio." Specifically, it was said that a song skipping feature was a major stumbling block for the record label.
With Sony now on board, Apple is expected to announced "iRadio" at its WWDC keynote next Monday. The anticipated service is expected to be a direct competitor to established streaming music services like Pandora.
Apple is also said to be revising its iAd network to run audio advertisements as part of the service. Ad support is expected allow users to stream content from "iRadio" for free when it launches.
Google also recently stepped into the streaming Internet radio market with All Access , which launched in May. The search company's subscription music service is expected to debut on iOS devices in the coming weeks.