In very simple terms devices which run Windows RT are tablets just like iPad and Nexus. So expect tablet apps to run on Surface RT (or whatever RT device you choose).
For running iTunes you should buy a "Surface Pro" but it is twice as costly since it can run tablet apps and iTunes like software too. I call it a mini beast

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If it is music management you want Surface RT can do it without iTunes just like other tablets.
I have posted these videos in other threads too I think they help in informing why Surface RT is a good tablet.
Why I love my Microsoft Surface RT - YouTube
Why I love my Microsoft Surface RT, Part 2 - YouTube