I needed to find out for work what images sizes were provided by iTunes. The API only provides links to 30×30, 60×60, and 100×100 pixel images. However, you can run a string replace to get larger sizes by replacing the string
100x100 with one of the below sizes. For example:
To see whether this could be considered reliable, I ran a series of tests to check what sizes were available across a range of albums. I checked in increments of 25, up to 2000.
It looks like the following sizes can be used:
If you want the code to try this on your own: