A video has appeared on YouTube showing the upcoming HTC Mozart being paired with a Nokia Bluetooth headset. The video also shows the full specs of the device, listed as a 1GHz Qualcomm QSD 8250, 512mb + 8GB ROM, 576mb RAM, 3.7″ WVGA Super LCD screen and 8mp CMOS camera. The Windows Phone 7 interface looks slick, clean and smart in this very brief display. Menus rely heavily on 3D transforms, with touch playing a large part in the manipulation of on-screen objects. WP7 is due for release in Europe in October and North America in November. HTC appears to be leading the market in non-iPhone multitouch…