booklet.pdf with multiple folders

[simoncn]

Do all these symphonies have the same ALBUM tag (for example, Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic) or do they have different ALBUM tags (for example, Beethoven – Symphonies 1-9, Simon Rattle, Berliner Philharmonic, Symphony No. 1)?

If they all have the same ALBUM tag, you can put a file named booklet.pdf or albumname.pdf in any of the subfolders containing any of the FLAC files. It won't work if you put this file in the top-level folder. For full details of how this works, see this section.