By scanning and compiling the MD5 hash of of each file it scans, Auslogics Duplicate File Finder can dig through your disks and find duplicates with mismatched names. Multiple copies of music and other media, even when oddly named, will be matched up. You can filter by file size and file type. Matching can be contingent on file name, date and size, and the file hash.
If you have a favorite tool for finding duplicate files, let's hear about it in the comments. Auslogics Duplicate File Finder is freeware, Windows only.