I'm upgrading from 1.5.1 to 1.5.3 and using only the changlog's of 1.5.2 and 1.5.3 to merge the changed files before pushing the changes and updates.

While doing so, I found the line in the changelogs:

/includes/modules/pages/product_music/main_template_vars_product_type.php

and could not find the folder "product_music", suspecting that it actually should be "product_music_info" as it does contain the actual file.

Just a heads up!