Apple will be signing a deal with Universal Music Group which is one of the major music groups in the industry. Warner Music could come next and before Apple tries to woo Sony in order to bask in total radio dominance.
Apart from radio dominance, the brand has a lot to benefit from which includes sales of songs on iTunes as also sales of its devices like the iPad and iPhone. Free radio will be the major crowd puller that Apple might try to exploit for their benefit. Moreover studies have shown that users tend to favor Sirius XM Radio if it involves exclusive programming and is integrated into new cars. If Apple plans on making use of this route it will have to make use of a satellite service to provide seamless service to its customers. Doing this will allow Apple to charge for its services.
However it seems that Apple will resort to promoting its services online and considering that most individuals already get music and videos for free due to piracy settings and torrent feeds it may be detrimental to its crusade of conquering the music world. There's a point of concern where if Windows users can download iTunes, then iRadio too should be available to them. Basically, iRadio should be made available on all platforms if Apple is looking to conquer the music world.