My 2 cents.
Creative types prefer Apple products 90% of the time. Even if Windows Phone were the superior platform for recording on the go, that isn't going to sway them as it doesn't have the "cool" factor that an Apple product has. WP8 is targeted squarely at two groups of people: Corporate and average consumers. Gamers are also target, but to a lesser degree. With its grid of square tiles, with their single solid color on a solid background, and focus on delivering information, WP very much appeals to left brain types who want organization and efficiency. In short, it puts function before form. I love how Windows Phone looks, but I am most certainly left brained, loving Science, math, and diving deep into technology (I can't remember the last time I had a computer running only a single OS). Microsoft shows off production applications, highlighting Office and its SharePoint capabilities. iOS (and Android, though to a lesser degree), put form before function. Developers can create very beautiful, artistic icons, but they don't tell you anything. It is full of textures that serve to beautify, but distract from getting at the info you want. You can choose a beautiful background to always see on your home screen, but it can make reading your icons more difficult. All of these things appeal to right brained, creative type peoples (artists, musicians, etc.) Apple likes to show off advanced apps like iMovie and Garage band. For this reason, I don't think you will ever have music apps on Windows Phone that are up to par with the iOS options.
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