split3pm is a tool to Extract music segments from a larger MP3 file. For example, you might have a long radio Capture in MP3 format and you want to cut out a piece of music from it. Before split3pm you would have had to convert the file to Wave and edit it there; now, you can just tell split3pm the time and duration of one or more audio segments and it will extract the files for you.
split3pm has been tested with very large MP3 files (up to 8 hours long), and is much faster for its purpose than any Waveeditor out there. split3pm is Open Source freeware and is available for both Win32 and Linux.