Hi there...I don't know if I know the answer to your question. I have never done it before...Maybe others can assist. My first thought is using an app like google music and streaming/copying your music to your iPad.
Or how about using iCloud and downloading your music from there?
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Thanks, Twerppoet for the clarification. I didn't think so, but needed clarification with all these specialty services attached to all these email servers now a days.