Eventually "Baby One More Time" started to lose steam, and Spears was ready to release her follow-up. "Oops!...I Did It Again" came out in the spring of 2000. The title track was an instant hit, going into the Top Ten. Entering the charts at number one and selling over a million copies in its first week of release, it set a new record for single-week sales by a female artist. Other singled were "Lucky," "Stronger," and "Don't Let Me Be the Last to Know," co-written by Shania Twain and her producer Mutt Lange. A year later, Oops!...I Did It Again had sold over nine million copies. Dating *N Sync heartthrob Justin Timberlake only added to the media attention.
In "Someday", the Drum Programming in the Chorus is virtually the same beat John Bonham used on "When the Levee Breaks" on the Zeppelin IV album by Led Zeppelin (much toned down of course - just almost rhythmically identical!). Notice the 6/4 measure in the verse.