Beets: Extendable command-line tool & library for cataloging, manipulating, & accessing your music library written in Python

http://beets.radbox.org/

Example:

$ beet import ~/music/ladytron
Tagging:
    Ladytron - Witching Hour
(Similarity: 98.4%)
 * Last One Standing      -> The Last One Standing
 * Beauty                 -> Beauty*2
 * White Light Generation -> Whitelightgenerator
 * All the Way            -> All the Way...

From the Beets Github page