With sales of over 300 million records worldwide, Madonna is the best-selling female music artist of all time. She is the most successful solo artist in the history of the U.S. Billboard Hot 100 chart and holds the record for the most number-one singles by a female artist in Australia, Canada, Italy, Spain, and the United Kingdom. With a revenue of over U.S. $1.5 billion from her concert tickets, she remains the highest-grossing solo touring artist of all time.