Rhianna was the newest artist I got into, but since then I haven't even gone looking for new stuff. Something similar happened to us a while back. We only have 2 "top 40" stations and the rest are all oldies or country. I stay away form the Christian radio. We had these two stations going head to head, both on the 99.1-99.9 range so it was easy to flip from one to the other. Then the 99.1 station, the one I liked the most, changed owners and became an all 80's pop station. Now I like 80's pop but I like to hear new stuff also. So I was stuck with just the 1 station. They then decided with their competition out of the way, they would follow suit and began playing more 80's music and less new music. They even went so far as to have a 80's 2 hour set and a 2 hour 90's set, 4 hours of nothing but old music, which dominated the time slots I had to listen to music.
Then the other station came back a year ago, full force and better than ever, but now instead of rock they were strictly Hip-Hop, Pop, and a little top 40 to mix it up. Well I like Hip-Hop a lot more than rock so no big deal, except they were losing money and had to change frequencies to 94.3 a long ways away from the other station and a lot less powerful so the reception is not that good anymore. But I discovered I-pod/I-Tunes a couple years ago and have had no reason to look back ever since.