Madonna is not only a singer, songwriter, and entertainer; she is an entrepreneur, an actress, an author, and a philanthropist. She is a pop culture icon, as she is an inspiration to many artists including Lady Gaga, Adam Lambert, Britney Spears, Taylor Swift, Katy Perry, Beyonce, Jennifer Lopez, Kim Kardashian, Pink, and more. The Queen of Pop has sold over 300 million records world-wide and as a result, she is the 2nd best-selling female artist in the US alone. So, what are the Queen of Pop's best songs? Just click here to find out.