LAME and it's task is to make MP3 smaller, so they fit in environments with little space (like old mp3-players). For this the software not only recompresses the mp3, it also copy over the ID3-Tags like the cover, the title and the artist, so you keep all the details of a song. In the end it only uses the recompressed version of the song if it's smaller. You can convert complete folders and M3U-Playlists. For easy access you can use drag'n'drop.