TuneSpan allows you to browse and span the media in your iTunes Library. To span your media means to distribute the files in your iTunes Library across multiple drives.
What does TuneSpan do?
TuneSpan helps you easily move the media files (Music, Movies, etc.) in your iTunes Library to multiple drives, avoiding the pitfalls of moving files manually. TuneSpan lets you browse and keep track of media in your iTunes Library on all drives, whether they're connected or not, and makes it clear to you what is and isn't currently available to play in iTunes. TuneSpan also offers sophisticated filtering options that aren't available in iTunes.