What is the song called by Madonna and Britney Spears?

The song by Madonna and Britney is "Me Against the Music". It was released in 2003 as the lead single from Madonna's ninth studio album, _American Life_. The song reached number one on the Billboard Hot 100 chart and became Madonna's 12th number-one single on the chart. It also reached number one in several other countries, including Canada, Australia, and the United Kingdom.

"Me Against the Music" is a dance-pop song that features a prominent guitar riff. The lyrics of the song explore themes of female empowerment and independence. The music video for the song features Madonna and Britney Spears dancing in a nightclub and on the streets of Los Angeles. "Me Against the Music" was a commercial success and was nominated for a Grammy Award for Best Dance Recording.