Apple has a pretty comprehensive list of shortcuts right on their website. I've pasted the URL in below. As far as I know, keyboard shortcuts with a physical keyboard on an iPad should work the same way as other Apple shortcuts.
For playback shortcuts, you can use option-right arrow or option-left arrow to skip forward or skip back an album. Command-left arrow or command-right arrow lets you skip between individual songs. You can also skip through pages in the music store by pressing command-right bracket () or command-left bracket ().
Command-up arrow and command-down arrow increase and decrease volume, and the space bar can be used to stop or start a selected song. The full list of shortcuts is pretty long and I wouldn't want to go through all of it here, but I've mentioned a few of the most important ones that I think I'd probably use most often.
Here is a short resource on some useful iPad keyboard shortcuts.
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