This will show you how to find and replace file names quickly without requiring any special software. You will be able to batch rename file names using the built-in Windows Powershell command. It sounds complicated, but I promise you it is not.
This is the code that is used for the PowerShell command in the video. Just edit it to fit your needs.
get-childitem *MP3 | foreach {rename-item $_ $_.name.replace("Stephen","OT06")}
get-childitem *MP3 | foreach {rename-item $_ $_.name.replace("Johnston","")}