Tool reached the top of the Billboard 200 album chart with "10,000 Days" on May 20, 2006.The album was the rockers' fourth studio effort and the second to reach number one. They scored their first number one LP with 2001's "Lateralus."The LP, featuring the singles "Vicarious," "The Pot" and "Jambi," was named after the approximate length of time lead singer Maynard James Keenan's mother had used a wheelchair. She had spent the last 27 years of her life paralyzed."10,000 Days" took over the top spot from Godsmack's "IV" and reigned for a week. It was eventually replaced by "Stadium Arcadium" by the Red Hot Chili Peppers.