In what is turning out to be a fierce holiday battle between two music heavyweights, Shania Twain managed to oust U2 from the top of the Canadian charts this week.

The Timmins, Ont. native's "Greatest Hits" recaptured the No. 1 spot with 56,100 in sales, up from the 51,000 copies sold last week.

Meanwhile, U2's "How to Dismantle an Atomic Bomb" dropped out of the No. 1 spot after one week, falling down to the second position, with sales of the album dipping from 94,700 last week to 47,200 this week -- a drop of 49 per cent.

Eminem's "Encore" (33,700) and "Canadian Idol" winner Kalan Porter's "219 Days" held onto No. 3 and No. 4, respectively.

The seasonal collection "MuchDance 2005" climbed two notches to No. 5, while Jay-Z and Linkin Park's mash-up album "Collision Course" had the highest debut of the week, at No. 6.

Teen queen Hilary Duff's self-titled effort moved from No. 8 to No. 7, Green Day's "American Idiot" re-entered the top 10 at No. 8, Rod Stewart's golden oldies disc "Stardust... Great American Songbook: Volume III" held steady at No. 9.

Gwen Stefani's debut solo effort "Love. Angel. Music. Baby." slid from No. 6 to No. 10 in its second week.

Other notable debuts included Kelly Clarkson's second album "Breakaway" at No. 17, and Nas's double album "Street's Disciple" at No. 27.

In the U.S., Jay-Z and Linkin Park debuted at No. 1, followed by U2 in second, Kelly Clarkson in third, Eminem in fourth, and Nas in fifth.