Listen to music with my Bluetooth headset

I just found out that if you are on a call with a BT headset and you start to play music, you can hear the music through your BT headset. I also found out how to get the sounds/music to go through the BT with out having a call come in. Just go to PHONE/VOICEMAIL and set the audio to the BT headset. When you now play music you hear it in the BT headset. You also hear the beeps when you get email and text messages. When a call comes in it will stop the music and you can talk to the person, then the music starts back again but it won't play in the BT headset after that.

Apple really needs to fix it so you have the option of listing to your music in your BT headset.