Untitled unmastered. hits Number One 51 weeks after the rapper's To Pimp a Butterfly topped the charts, making Lamar just the third artist ? with Drake and Future ? to land at least two Number One albums since January 2015, Billboard reports. Compare that to last week's Number One album, the 1975's I Like It When You Sleep, For You Are So Beautiful Yet So Unaware, which dropped out of the Top 10 completely in its second week of availability.