Is it possible to use an apple TV2 with standar tv (composite)
Unfortunately, according to Apple, the only connector the new Apple TV has is HDMI, which means, if you want to use it with your TV that doesn't have HDMI input, you'll need an adapter. Just google 'HDMI to composite adapter'

If you only want the audio, then .... you'll still probably need an adapter. HDMI cables carry both audio and video so you'll need to convert the signal to something your TV will accept to get any music playing.