MP3 Speed is a freeware which changes the speed of mp3 files. Change MP3 speed by changing both tempo and pitch. Change MP3 speed without changing pitch to avoid producing unwanted chipmunks. Speed up audiobook to save drive size and listening time. Slow down MP3 file to make the speaking slowly and clearly. Make your own editions of quickening tempo and slow tempo music. It can copy & save audio tag from the source files to the destination ones, MP3 Speed is capable of writing ID3v1, ID3v2 and APE MP3 tag. It supports batch mode and can convert hundreds of MP3 files at once. It is incredibly fast and fully optimized for SSE/Hyper thread technology and you can get extra speed boost if you have multi-core CPU. MP3 Speed supports on-the-fly converting, in other words, it does not generate temporary files during the conversion process. It is fairly intuitive to use with its Windows Explorer-Style user interface. It supports drag & drop. MP3 Speed can effortlessly search, add and manage the MP3 files to be converted. It uses the latest Lame MP3 encoder which is generally believed as the the best MP3 encoder. The last but not the least, MP3 Speed is Windows Vista compatible and works with Windows 7 (64-bit and 32-bit).