Will be interesting to hear what you make of it all!
For iTunes I would:
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go to the a-tisket page
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paste the iTunes album/EP url into the top field, click ‘get ID’, then click ‘search’ at the bottom
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click ‘submit album to MB’ at the bottom of the next page
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now, complete and double check all the release fields as you usually would
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after submitting the release, a-tisket will pop up another page that lets you submit cover art and isrcs*
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if you left the annotation added by a-tisket with the release, you can now go to the relationships tab and enter (p) and/or (c) very quickly with this script.
*the tool only adds isrc’s if there is a Spotify link that’s been found as well. So an iTunes only release is an unfortunate example, maybe someone else has a good way to enter it into the workflow
Have fun!