It seems like only yesterday that we were reporting that Apple had secured two of the four major music labels for its cloud music service -- and it was! Only 24 hours later, it appears that Sony makes three, with the lone holdout also close to a deal.

Bloomberg is reporting that Apple has followed up its cloud music license arrangements with Warner Music and EMI by nabbing Sony Corp. That leaves only one major label -- Universal Music Group, who is also the largest of the four, but also appears close to a deal with Cupertino.

Neither Apple nor music label representatives would comment, and the iOS device maker will still have to pursue separate agreements with music publishers before any deal is a lock.

As we reported Thursday, Apple has been making the rounds to secure licenses that would allow them to store music tracks on cloud-based servers. A future version of iTunes would then presumably scan a user’s library to determine which music they already own, then allow internet-based access to those tracks without the need for uploading them -- an arduous task which both Amazon and Google’s cloud storage services require, since they launched without support from the music labels.

Cloud services are anticipated to be the next big thing in the music business -- or at least that’s what the major labels are hoping. Revenues are down once again, years after Apple helped boost them once before in 2003 with the introduction of the iTunes Music Store, which offered a simple, legitimate way to buy music and easily sync it with an iPod.

It may take more than an Apple miracle this time around for the music labels to ride high with digital music again, but the way things are lining up, we may not have long to wait and see -- Apple’s Worldwide Developer Conference kicks off on June 6, which could be the event where the company kicks off its MobileMe refresh, complete with a cloud-based “music locker.”

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