hey...just looked further...it says:

"Often needed functions, especially for music files (optional)

Delete beginning number, if filename starts with a number.
"12- Michael Jackson - Thriller.mp3" => "Michael Jackson - Thriller.mp3" (typical when grabbing or converting)
Replace underscore "_" if possible: "don_t" => "don't", "i_m" => "i'm" etc.
Replace underscore "_" to space between letters: "Michael_Jackson" => "Michael Jackson". Typical when downloading files from the internet.
Delete unnecessary space: "He & You" => "He&You", "( Remix )" => "(Remix)" etc
Typical song renamings: "Featuring" => "~", etc
Delete space at the beginning and at the end. Kill double space."