iTunes can store PDF “digital booklets,” or liner notes. You may get some of these when you purchase albums from the iTunes Store, but if you download music from other sites, and get liner notes, you need to add them to your iTunes library.
It can be a bit tricky, though, since dragging them to your iTunes library doesn’t add them in the right place. Here’s how you can add PDFs of liner notes to your iTunes library, and store them with their albums.
I recently downloaded a new recording of Handel keyboard suites, played by Danny Driver, from Hyperion Records. Hyperion includes both PDFs and ePubs of their liner notes with their downloads; I keep the PDFs. You can see some of the files, with the PDF at the top of the window:
I find it easiest to work with a “Temp” playlist in iTunes. I drag my tracks into that playlist, then I can tag them easily. So here’s what I see when I drag that album, and the digital booklet, into iTunes:
You can see the digital booklet at the top of the list. Select all the tracks, press Command-I, then apply the same album name to them; the digital booklet has no tags other than its name. Change any other tags you want at the same time.
You’ll see that the digital booklet shows up with the album:
If you select the digital booklet, then press Command-I, you’ll see its tags:
That’s all there is to it.
Note: sometimes, I’ve found that the digital booklets don’t stay with albums. In that case, select the booklet, press Command-I, and check the tags; in some cases, iTunes seems to lose them.