Why does the cover art get mixed up when I play my songs in a music app?

[ohrenkino]

I am not sure if you go for accuracy or just a "let's see if it works".

For the latter approach I would suggest that you copy the contents of ARTIST to ALBUMARTIST and the contents of TITLE to ALBUM (so it looks like an EP).

To copy one field to another, see the FAQs:

Actions and batch-operations

How to copy one field value to another field? Example how to copy the content of the ARTIST field to the ALBUMARTIST field: Create a new action in an existing action group or make a new action group. Action type: Format value Field: ALBUMARTIST Format string: %artist% Note: If you want to copy all possible values of a field (in case you have multiple artist fields), the internal scripting function $meta_sep can be used in the format string, e.g., $meta_sep(artist,\\\\)