In reply to Touché.

"what is more repetitive than some of them dance pop song,and they are selling like..."?
First off, we are not talking about pop music, we are talking strictly about R&B so I don't know why you even brought that up. However, even the sales in pop are NOT considered to be as great as it could be. In fact, most pop artists who add those repetitive dance pop songs are flopping all over the place nowadays so that's wrong on your part. Lastly, yes there is a problem with R&B, it's completely seen as stale and dated especially if these R&B artists keep adding rappers to their songs.