Do any of these run from the command line? The reason I need a command line version (Which I know Napster won't) is so I can telnet into my OS X box at home and run it.
The first one I listed "Maxter" is written in Cocoa. A very good app. I'm sure if you e-mail the author he will tell you how to do what you want. Make sure you read the "MaxterManual.rtfd" before you ask.