You can use Mp3tag to rename your mp3 files massively and easily. I've been using it for years and it is very comfortable. Further info:
Mp3tag is a powerful and yet easy-to-use tool to edit metadata of common audio formats where it supports ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE Tags.
It can rename files based on the tag information, replace characters or words in tags and filenames, import/export tag information, create playlists and more.
Mp3tag supports online database lookups from, e.g., Amazon, discogs, or freedb, allowing you to automatically gather proper tags and cover art for your music library.
- Batch Tag and Filename Editing
- Support for Cover Art
- Import from Amazon, discogs, freedb,
- Replace characters or words
- Create Playlists automatically
- Rename files from tags
- Export to HTML, RTF, CSV
- Full Unicode Support