Guys, mostly they show latest songs in the evenings which they use to show on Sony Rox HD for the whole day, only these songs are in full screen, I think only to highlight the difference of HD, especially to those who watch the SD channels by zooming it and get the complete content on the screen as they are shown with the black bars, but for new songs only they have changed the AR to full screen, and its since they launched the SonyRox HD channel, but rest of the day, when they show mix songs of 80's & 90's and some songs upto 2005, they still show it with black bars and its not new, they have changed AR of new songs only which they show on Rox HD in 16:9 AR and that too only since Rox HD is launched !!