The Philips SongBird is an application that allows you to manage the Phlips Go Gear devices. It allows you to transfer multimedia files and created playlists. You can't install it on your device since it's working only on Windows operating systems.
There is no download on the official website, which means you have to download it through the Software Informer download page: http://philips-songbird.software.informer.com/download/#downloading
Access the link above and wait a few seconds then the download will start. Install it, connect the device to PC and then you can transfer the files and create playlists.