I think the problem may be with iTunes. I don't think you actually lost anything, it was probably just re tagged. I had problems with iTunes in that it just took over and tagged my music without giving me an option. I don't know if there's a solution, I just stopped using iTunes. To check, look at your music collection with a file manager. If everything is there, all you need to do is re tag the files.
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Tags are labels you assign to music files to make them easier to work with. Things like genera, title, artist and year... etc, are some examples of popular tags. It sounds simple, but you need to be careful. Its easy to confuse tags with the info you see in your file manager. When you are looking at tags, its usually called library view. When you are looking at music files in your file manager, its not the same thing. For example, if you are in iTunes listening to music by The Rolling Stones, the tag for the artist is The Rolling Stones. Now, if you leave iTunes and access the music files directly, the artist could be Rolling Stones instead of The Rolling Stones, like you see in iTunes. Tags and file info have nothing to do with each other. They can be different. I bring this up because it can drive you crazy if you don't understand what's going on. Someone will change or edit tags in a program like iTunes but when they look in their file manager, nothing has changed, and they think something is wrong.
In your case, I think its very likely, iTunes changed some tagging info, file info or both. Using The rolling Stones as an example again, in iTunes, you may have tagged "The Rolling Stones". If iTunes re tagged some of your music using the name Rolling Stones instead, its now a different band in iTunes. And that's how you loose your music. In this example, you would fix things by changing the tag Rolling Stones to The Rolling stones. Once the tags are labeled properly, your music should show up.
If you need good tagging software, download a free music player called Quod Libet. Since you didn't say what OS you have I chose Quod Libet because it works on Mac, PC and Linux.
"If that doesn't work, try adding the library to iTunes so it will rebuild tagging info. Usually I delete everything in iTunes folder before adding the library."
That's exactly the problem I had with iTunes. It takes matters into its own hands, and starts retagging everything. I don't see why you would want it to do something like that.
07-26-14: Zd542My suggestion is if rescanning his library doesn't work in Logitech Media Server, then try adding/importing library into iTunes AGAIN. Basically delete old state info and re-add.
He configured LMS to use iTunes ... I never had problems with iTunes or LMS. BTW I prefer LMS over JRiver, PS Audio, MinimServer ... for SQ and reliability. Too bad they got bought out.
My guess is index needs updating in LMS.
"My suggestion is if rescanning his library doesn't work in Logitech Media Server, then try adding/importing library into iTunes AGAIN. Basically delete old state info and re-add."
I don't know if we're talking about the same thing. I haven't used iTunes in years, but if I remember correctly, it would sometimes change tagging info and file structure on music I added to the iTunes library. If there was a way to stop it, I couldn't find it, so I just stopped using iTunes altogether.
Something else I just thought of is that I've used several media players that couldn't handle large collections. I never tried LMS, but it may be something to consider.
I have 3612 CD's ripped in loss-less, with 42256 songs occupying 1.2 Terabytes of space. That 2972.5 hours of playing time or almost 124 days before hearing a repeat. LMS has no problem indexing it. My last scan took exactly 100 seconds.
Seams to me that it probably comes down to 3 possibilities:
1. Corrupted index file
2. iTunes has changed something with tagging/file type for the missing songs. Is the latest MP3 Squabbler installed in LMS?
3. Change in the way LMS is indexing the iTunes library.
Keep us posted.
This suggestion might be of some help. It restores the iTunes library to an earlier state, and is described as often being a solution for, among other things, library corruption that may result from "upgrades."
It's very simple to do, and very simple to undo if necessary.