Song Sergeant

Song Sergeant intelligently identifies and removes duplicates, renames inconsistently named artists and albums, reunites orphaned song files to your library, and deals with missing song files. Song Sergeant will whip your music library into shape in no time.
Features:

Finds and removes duplicate song files
Intelligently merges the best song information with the best audio data
Preserves your playlists while removing duplicates
Identifies inconsistently named artists and albums
Discovers orphaned song files within your music folder but not seen in iTunes
Reunites missing library songs with orphaned files
Fix problems quickly and automatically or with great manual control
Detailed 'related songs' drawer helps you make decisions