Amazon’s music app ‘aMusic’, has disappeared from Apple’s iTunes. Apparently, the app was removed due to “legal issues with the music industry.” Labels were not too pleased with the way the app united Amazon’s cloud music lockers with Apple’s iOS devices.

aMusic, a $2 app, lets you play music in your Amazon storage locker on iOS devices.

Google’s, gMusic service, similar to Amazon’s aMusic, which is available on iTunes might also be on its way out.

Here’s the full statement from James Clancey of Interactive Innovative Solutions (IIS) to Evolver.fm about the state of his company’s aMusic and gMusic apps:

There are some legal issues with the music industry. The aMusic [app] is down temporarily. It will be back. Unfortunately I do not have a specific date when it will be back.

Also, Apple has been delaying my gMusic update. I submitted it 2 weeks ago. Every other update I have submitted within the 2 weeks has been approved in under 8 hours. So not sure what the deal is.

Until recently, it was possible to play music from the big three clouds (Amazon, Apple, and Google) from the same iPhone (so far as we can tell, Dropbox can play cloud music too, but only via the web). You could use them essentially the way we used to use cassettes for mix tapes, increasing your cloud-based music capacity without paying more.

For example, you could upload new music discoveries to Music Beta by Google, mirror your old favorites to Apple iCloud, and put all your workout music and perhaps a few niche genres on Amazon Cloud Drive.

However, separating music clouds from their mega-sized motherships turns them into commodities. If you can use all three of these music clouds with the same phone just by tapping a different app, you’re unlikely to develop an exclusive reliance on one or the other, which is what each of these companies hopes will happen (see also: “iCloud Is Like a Roach Motel You’ll Love Anyway“).

Clancey says aMusic’s deletion from iTunes is temporary, and that aMusic will reappear in the iTunes app store soon.