NEW YORK (AP) - Britney Spears is number one on the Forbes list of the top-earning women in music. Forbes estimates that Spears made $58 million in a 12-month period. She was $1 million ahead of Taylor Swift and $5 million in front of Rihanna. Lady Gaga is in fourth place with $52 million, more than double Katy Perry's $25 million take. The rest of the top ten are Beyonce, Adele, Sade (SHAR'-day), Madonna and Shakira.