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If you want to spend money equinux has solutions for you if you have a mac:<br />
<br />
<a href="http://www.equinux.com/de/products/coverscout/index.html" rel="ugc">http://www.equinux.com/de/products/coverscout/index.html</a><br />
<a href="http://www.equinux.com/de/products/songgenie/index.html" rel="ugc">http://www.equinux.com/de/products/songgenie/index.html</a><br />
<br />
With these I have completed most of my songs (128'532 currently in my iTunes library)<br />
<br />
I also use <a href="http://www.mp3tag.de/index.html" rel="ugc">http://www.mp3tag.de/index.html</a>&nbsp;to verify what the above did.
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If you want to spend money equinux has solutions for you if you have a mac:

http://www.equinux.com/de/products/coverscout/index.html [http://www.equinux.com/de/products/coverscout/index.html]
http://www.equinux.com/de/products/songgenie/index.html [http://www.equinux.com/de/products/songgenie/index.html]

With these I have completed most of my songs (128'532 currently in my iTunes library)

I also use http://www.mp3tag.de/index.html [http://www.mp3tag.de/index.html] to verify what the above did.

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I have an extensive iTunes Library, much of which is missing tag information or album art. I want to find some software that will manage the iTunes library in situ (in place) where I can search for tag information and artwork through discogs or similar internet dbs. <br />
<br />
I don't mind if the program keeps it's own database, but it must sync the tags/artwork with the iTunes library as I use that as my player and with my iPhone/iPod
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I have an extensive iTunes Library, much of which is missing tag information or album art. I want to find some software that will manage the iTunes library in situ (in place) where I can search for tag information and artwork through discogs or similar internet dbs. 

I don't mind if the program keeps it's own database, but it must sync the tags/artwork with the iTunes library as I use that as my player and with my iPhone/iPod

Manage iTunes Library with other software to update tags

Software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of programs, libraries and related non-executable data (such as documentation). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level programming languages than machine language. High-level languages are translated into machine language using a compiler or interpreter or a combination of the two.

Software

Digital audio is technology that can be used to record, store, generate, manipulate, and reproduce sound using audio signals encoded in digital form. Following significant advances in technology, digital rapidly replaced analog audio technology in most areas. Digital audio systems may include compression, storage, processing and transmission components. It is important to distinguish between the audio coding format, the codec performing the encoding and decoding of the raw audio data, and the container file. Common file formats include .wav, .aiff, .au, .m4a, .mp3, .wma, .ra and .raw.

Digital Audio

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.