What's the best-selling single of all time? That's a simple question with no easy answer. Or rather, two easy answers and one that was hard to arrive at. Let me explain. Bing Crosby's "White Christmas" is estimated to have to sold at least 30 million copies since its release in 1942. For decades, the song was widely regarded as the all-time best-seller. But 11 years ago, Elton John's "Candle In The Wind 1997" quickly sold a comparable number.

Both songs were massive chart hits.

"White Christmas" topped the Billboard pop chart for 11 weeks in 1942 and returned to the top spot in 1945 and 1946. It's the only song ever to reach #1 in three separate chart runs. The song was a chart fixture in nearly every holiday season through 1962. It amassed a total of 77 weeks on the chart, more than any other single ever.

"Candle In The Wind 1997" entered the Hot 100 on Oct. 11, 1997 (55 years to the week after "White Christmas" debuted). It opened at #1 stayed on top for 14 consecutive weeks. The

Way back when, in the dim and distant past, women were referred to as "the weaker sex." It's a new day, baby. Female solo artists account for eight of the top 10 albums on The Billboard 200. Susan Boyle leads the pack as I Dreamed A Dream debuts at #1 with sales of 701,000. That's the biggest one-week sales total of 2009. It beats Eminem's Relapse, which sold 608,000 copies in its first week in May. It's also the biggest first-week sales tally in Nielsen/SoundScan history for a debut album by a female artist. It tops Ashanti, which opened with sales of 503,000 in April 2002.

Two male solo artists (Andrea Bocelli and Adam Lambert) round out the top 10. This means that groups and duos are completely shut out of this week's top 10. (The highest-ranking group or duo is the contemporary Christian group Casting Crowns, which dips to #17 with its Christmas album, Peace On Earth.)

Only one debut album in Nielsen/SoundScan history has sold more copies in its first week. That's Snoop Doggy

The Twilight Saga: New Moon was #1 at the box-office over the weekend, three weeks after its soundtrack album reached #1 on The Billboard 200. New Moon is the 23rd movie in the past 28 years to top the weekend box-office listings and also spawn a chart-topping soundtrack.

It's hard enough to reach #1 in just one of these arenas. To top both charts is a remarkable achievement (as evidenced by the fact that it happens, on average, less than once a year.)

The movie/soundtrack tie-in goes through hot and cold spells. We're definitely in an upswing. The Twilight Saga: New Moon is the fourth movie in a year to hit #1 at the box-office and generate a #1 soundtrack. It follows Michael Jackson's This Is It, Hannah Montana: The Movie and the first Twilight. This matches the frenetic pace from July 1997 to July 1998 when Men In Black, Titanic, City Of Angels and Armageddon all hit #1 at the box-office and spawned chart-topping soundtracks.

The weekend box-office charts, dating back to January

Billboard has seen the light. Starting in two weeks, the magazine's flagship The Billboard 200 album chart will include older "catalog" albums. The move was prompted by Michael Jackson's phenomenal success this year, little of which was reflected on The Billboard 200. Jackson's Number Ones was the best-selling album in the country for six weeks this summer, but because the 2003 release was a catalog album, it wasn't allowed to appear on the big chart.

"The events of 2009, and the continuing creativity in the repackaging of catalog titles, have led us to conclude that the Billboard 200 would be best served presenting the true best-sellers in the country, without any catalog-related rules or stipulations, to our readers, the media and music fans" said Silvio Pietroluongo, Billboard's director of charts.

Starting in two weeks, the magazine will base The Billboard 200 on Nielsen/SoundScan's Top Comprehensive Albums chart (which includes both current and catalog titles) instead of the Top