AllThingsD reports that Apple has signed Sony Music on for iRadio, the long-rumored, ad-supported music service Apple has supposedly been working on for eons.

Last month, reports circulated that Sony was the lone hold out amongst the major record companies stalling iRadio; Warner Music Group and Universal Music Group had reportedly already signed on. If the rumors are true and all three majors now on board, we can expect to hear Apple announce its new radio product during the WWDC keynote on Monday. [AllThingsD]