Jason Aldean's Night Train sold 409K copies in its first week. That's the second biggest opening of the year, trailing only Mumford & Sons' Babel, which opened three weeks ago with sales of 600K. But another, faster train is coming down the track. Taylor Swift's Red, which was released on Monday, is on target to sell more than 1 million copies in its first week.

Night Train is Aldean's first #1 album on The Billboard 200. It's his fourth to crack the top five, following Relentless (#3 in 2007), Wide Open (#4 in 2009) and My Kinda Party (#2 in 2010).

A hip-hop duo that many of you have probably never heard of has this week's top new entry on The Billboard 200. Macklemore & Ryan Lewis debuts at #2 with The Heist. The album debuts higher than new albums by such household names as Kiss (which was hoping to finally land its first #1 album) and Barbra Streisand (who was hoping to extend her streak of a #1 album in each decade).

Macklemore (real name: Ben Haggerty) and Ryan Lewis first teamed for an EP in 2009. Two of their songs entered the Hot R&B/Hip-Hop Songs chart last week: "Thrift Shop" (featuring Wanz) and "Same Love" (featuring Mary Lambert). (The latter song expresses support for the legalization of gay marriage.)

Last week, you'll remember, Mumford & Sons' Babel trounced new albums by such heavyweights as Green Day and No Doubt. This week, Babel stays on top of The Billboard 200 for a second week, but the big surprise is that Green Day's Uno! and No Doubt's Push And Shove both drop out of the top 10. Uno! drops from #2 to #11. Push And Shove drops from #3 to #13.

It's increasingly common for albums to fade quickly after big (or even not-so-big) first weeks. Of the five albums that debuted in the top 10 last week, only Babel remains. Albums by Lupe Fiasco and Deadmau5 also drop out this week.

This is particularly bad news for Green Day and Lupe Fiasco, whose albums have sequels scheduled for release. If the first installment drops out of the top 10 after one week, that doesn't exactly bode well for the series.

This is pitiful: Just three albums have topped the 1 million mark in U.S. sales so far this year. But the tally will be more like 12 before the year ends, which would nearly equal the tally of 13 in each of the last two years. The three albums that have sold 1 million or more copies already this year are Adele's sophomore album, 21 (4,027,000); One Direction's debut album, Up All Night (1,254,000) and Lionel Richie's surprise comeback hit, Tuskegee (1,020,000).

Four albums that have already been released will probably make it over the 1 million threshold before the year is out. They are Justin Bieber's Believe (which has sold 902K copies so far this year), Carrie Underwood's Blown Away (823K), Luke Bryan's 2011 release Tailgates & Tanlines (802K) and Mumford & Sons' Babel, which sold 600K this week and will probably sell another 155K next week.