Impossible, I use more themes and all works good.
Only in the lyrics plugin there where gone.
Also with other plugins where header is showed they are working.
So why not with the lyrics one.
The lyrics addon does use the header as it's loaded by MyBB.
If the images are wrong you'll need to direct link them because the folders could not work otherwise. Or you do make your own header inside the lyrics files.
Thank you for the editing for the musicstyles. Is it also possible to remove it from the add lyrics list. So that people do not had to choose for the style.
What I mean with banner you can see in the attachment.
With html I can show you exactly what i mean.