Put PS3 music player in the 'background'

After eventually getting my PS3 to stream music properly from a DLNA server… I was frustrated because I thought is was not possible to listen to the music whilst using other functions on the PS3, such as the web browser. But, then I found (by accident) that if you press the ‘Ps’ button in the centre of the controller whilst in the music interface… it drops back to the PS3 menu and the music keeps playing in the background. nice.