Music on News Bulletins

I know that I'm going to need to use music for my radio station so I'm going to listen to a range of different news bulletins on completely different radio stations to see what music, if any, they use. I'm going to be looking at what type of music is playing, when the music is played and when it fades out.

Kiss FM - Throughout the whole news bulletin music was playing. It was quite dramatic music as the music behind news bulletins usually is, but it was more up-tempo. 

BBC Radio 4 - No music was playing at all during the news.

Planet Rock - There was no music playing during the time when the news was being read, but during the news jingle, before the news, rough rock music was played.

From this research I haven't found a definitive answer regardin music during the news (there seems to be no absolute set convention). I think that I will include music in the news jingle, which will fade as the presenter starts reading the news.