To display music sheet, reading books, listening music and watching pictures or movies the tablet with the best price/performance ratio right now is the new Kindle Fire HDX 8.9 sold by Amazon.
I am waiting till the Christmas frenzy will be over and then will most likely buy one.
The only clear advantage of the iPad is the number of apps it can run, but for basic tasks like reading music or books this to me is a more sensible choice.

Kindle Fire HDX 8.9
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