Usher is back on top of the U.S album charts with his new release Looking 4 Myself.

The album is the R&B star's fourth number one - but, with just 128,000 sales, it registers as the singer's worst debut sales week since the release of My Way in 1997.

Meanwhile, veteran rockers Rush land their best sales week for a decade, debuting Clockwork Angels at number two on the new countdown with 103,000 sales.

Adele's 21 drops two spots to three, country star Josh Turner debuts Punching Bag at four and singer-songwriter Ed Sheeran scores the highest debut for a British male artist since Radiohead's Thom Yorke bowed at number one in December, 2009.

Sheeran's is a new entry at five.