Pop star Janet Jackson scored her seventh No. 1 album on the weekly U.S. Billboard 200 album chart on Monday, making her only the third musician to achieve a chart-topping record in each of the past four decades, Billboard said.<br />"Unbreakable," Jackson's eleventh studio album and the first after the 2009 death of her pop star brother Michael Jackson, sold 109,000 albums, 44,000 songs and was streamed nearly 4 million times in the week ending Oct. 8, totaling 116,000 units according to figures from Nielsen SoundScan.<br />The only other artists to score a chart-topping record in each of the past four decades are Barbra Streisand and Bruce Springsteen.
