Aretha Franklin is actually known as one of the greatest singers of all time and there are some people who are not sure why. You may need to listen to more than three songs to fully understand and appreciate the quality of her voice. She does not sound like anyone you have ever heard before. This alone makes her unique.
There are only a few singers who have distinct voices. This means that the moment you hear them sing, you know who you are listening to no matter what the song is. This is exactly what Aretha can do. She has a distinct voice and that alone is enough to make her a good singer. Then again, she has hit all the required notes in a very soulful manner.