I’d like for the comment audio field to be shown next to the other fields in the song details menu.
I use the comment field for urls of songs / videos, and this would let me open them trough the app. Ideally, you would be able to click on these if they are links to open them in the default internet browser.
Same as above. One of the most popular ways to use the comment field is for this exact case. Also, pretty much every other app / server shows the comment field.
Other application solutions:
Not sure about mobile apps, but desktop ones usually just add an option to add the comment field to a table + also show it when you click get more info / details button.