ruby-mp3info read low-level informations and manipulate tags on mp3 files.

* written in pure ruby
* read low-level informations like bitrate, length, samplerate, etc...
* read, write, remove id3v1 and id3v2 tags
* correctly read VBR files (with or without Xing header)
* only 2.3 version is supported for writings id3v2 tags