Dual Player

Dual Player is a tool you can use to compare 2 sound files in order to find differences in them. If your files are in different formats (like MP3 and WAVE) or differ in length then you can't use hashes (CRC-32, MD-5) to compare them. But you can use this tool and check in a few seconds whether your music files are different or not. Then yon can decide which file to keep and which to delete.

Main features

Opens different music files (mp3, wave)
Minimalistic interface so you can focus on the job not the buttons