iTunes Store audio files contain a number of tags that can’t be done in iTunes, so audio files ripped from CDs will lack these. I tag these myself in a process that I refer to as double-tagging. This is not necessary by any means but I like the sense of completion that I get from doing this. This technique only works on the Mac because of the software I use.
Open the files in the venerable Lostify. If you check the option to add a script to iTunes, then you can select a range of songs in iTunes, then select the Lostify… link in the Script menu.
I have based my selection of additional tags on what I have observed with iTunes Store files. The tags to add are Release Date, Kind, Copyright and Content Rating.
The release date is something you will have to research. Luckily, most CDs will be covered on the internet. I use Wikipedia, Rate Your Music, official artist sites, record label sites and the iTunes Store itself. Bizarrely, the most unreliable sources for release dates are often the official artist sites and record labels. If you find more than one date, try to take the most common one.
A note on compilations and rereleases. Consider The Chemical Brothers‘ Brotherhood. It’s a singles compilation, released on 2 September 2008. Instead of tagging individual songs with the year that they were originally released, I tag each with this release date. The thinking is that the title on which the songs appear was released in 2008, as a discrete unit, so that’s the date to go with. It has the added advantage of sorting properly in iTunes if you sort by Album By Year. If you have individual years for the songs, it will force the whole album to the front of the list, as iTunes interprets the earliest date that appears in the album as the album date.
It’s not so clear-cut with rereleases. I’ve got a 25th anniversary edition of Deep Purple‘s Machine Head. It was released in March 1972. My edition is obviously 1997. As the whole album is essentially intact and contains no new material, I have tagged this as 1 March 1972.
That’s another thing: sometimes you will not get a complete date. If you get, for example, March 1972, then make the release date 1 March 1972. If you get 1972 only, then make it 1 July 1972.
This should be set to Normal (Audio), unless you are tagging an audiobook, in which case it will be Audiobook.
Begin this string with the Recording Copyright symbol ℗ (activate the character palette by pressing Command-Option-T, then do a search for it and add it to your favorites for ready access), then the year and the owner of the sound recording (not the artwork; these are sometimes separate), all obtained from the rear of the CD, the disc itself, or at a pinch, the iTunes Store.
That makes a very satisfying completely tagged file. You can admire your handiwork in the General tab of the Get Info dialog (copyright) and the Release Date column, which you can add to any view:
There are three options here, Inoffensive, Clean and Explicit. The differences between these are important.
Inoffensive is the default and most iTunes Store songs are tagged as this. It doesn’t appear in iTunes. It is not possible to tag a track as Inoffensive with Lostify due to an unhandled bug, so leave it blank for now.
Explicit is self explanatory. If your CD mentions any kind of warning, then use this. Good for filtering out music that you don’t want kids to hear.
Clean is often misunderstood. It doesn’t mean Inoffensive. It is to be specifically used to indicate that it is a version of an explicit song, altered to remove explicit material. Sometimes albums in the iTunes Store are presented as both explicit and clean versions, so you can buy either. This could also apply to audiobooks and podcasts if they are altered, cleaner versions. There is very little call for this option.
I hope there are people out there that are as passionate about double-tagging as I am!