I do notice it when the artists are been interviewed. Their accent became so thick that I couldn't understand what they are saying but the songs were more understandable. There are great singers but I don't know why they change accent when speaking.
To be able to sing, they most times have to dig deeper with the way that they speak. It is quite different when they are talking normally with others. The energy to use the same voice when they are talking is quite different, and I understand why it is so.