The AudioItem structure has a required attribute albumArtUrl.
Which resolution should the image at this URL have?
Is the resolution different for different targets e.g. mobile, fridge, tv?
For the Mobile target, the UI is 96dp X 96dp so that would be the minimum recommended resolution.
However, there are no specific requirements for the resolution of images defined in this property. We recommend that you test them out on the device or the corresponding Simulator view to ensure that your users are presented with the most crisp and clear images on the devices you plan to support.