[ubuntu] 'Just create ".is_audio_player " on your USB stick.' How do I do that?

Hello, Ubuntu 12.04, clean install. Plenty of music in Rhythmbox, I want to transfer to a USB memory stick to use in the car. Copy and paste won't work.

Rhythmbox help says

If Rhythmbox Music Player does not detect your device as a portable audio player, you can create an empty file named .is_audio_player at the top level hierarchy of the filesystem of your player.