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Google Play Music
I have tried to set up Google Music Play service in Opera 25 but it failed because Opera isn't supported browser as I learned later (Supported browsers are: Google Chrome, Firefox, Safari or Internet Explorer 7 or newer).
So can you somebody advice how to do it? I thought that it shouldn't be a problem as Opera uses Chromium ...
Thanks & regards!
OK, I have found a solution ... you have to download the standalone application (Music Manager) to your PC through which you can upload and then play music on Google Play interface in Opera.
The problem in Opera is that while it supports Chrome extensions, it doesn't support Chrome applications. That's the problem. Therefore you have to use the Music Manager.
I hope that Opera will come up soon with support of Chrome applications!