“Thrift Shop” by Macklemore & Ryan Lewis featuring Wanz holds at #1 for the third week. It’s #1 on Hot Digital Songs for the fourth week. Impressively, the song’s sales have increased in each of those four weeks, from 236K to 279K in its first week at #1, then to 341K, then to 357K, and now to 381K. It’s the first song in the nine-year history of the Hot Digital Songs chart to post a sales increase in each of its first four weeks at #1.

The genial song about bargain-hunting has a shot at another sales record. This is the fourth time the song’s weekly sales have topped 300K. (It first reached that mark in the week that included Christmas). The song may match fun’s record for the most weeks above 300K in weekly sales. “We Are Young” (featuring Janelle Monae) topped that mark seven times.

“Thrift Shop” holds at #1 on Hot R&B/Hip-Hop Songs for the fourth week. This is the longest run at #1 on the R&B chart for a song by a white artist since Robin Thicke’s “Lost Without U” spent 11 weeks on top in 2007. The song is #1 on Hot Rap Songs for the fifth week.

Needless to say, it’s the best-selling song so far this year. It will probably be up for a Grammy for Record of the Year at next year’s ceremony.

Two more songs by Macklemore & Ryan Lewis debut this week. “Can’t Hold Us” opens at #97. “Same Love” bows at #99.

Gary Allan’s Set You Free enters The Billboard 200 at #1. It’s the country star’s first #1 album. Set You Free also enters Top Country Albums at #1, ending Taylor Swift’s 13-week lock on the top spot. This is the second time that a Swift album has been knocked off the top of the country chart by a star who is much less famous than she is. Fearless was bounced from #1 in February 2009 by Dierks Bentley’s Feel That Fire.

Allan, 45, is far from an overnight success. He first cracked the pop and country album charts in 1996 with Used Heart For Sale. Set You Free is his fifth top five album on The Billboard 200, following Tough All Over (#3 in 2005), Greatest Hits (#5 in 2007), Living Hard (#3 in 2007) and Get Off On The Pain (#5 in 2010). It’s his third #1 on Top Country Albums, following Tough All Over and Greatest Hits.

Allan’s “Every Storm (Runs Out Of Rain)” jumps to #1 on this week’s Hot Country Songs chart. It's Allan's first #1 country hit since 2004’s “Nothing On But The Radio.”

In honor of Martin Luther King Jr. Day on Monday, here are 25 songs that touch on civil rights and race relations. This is not meant to be a complete list, but it’s a good cross-section of artists, styles and themes.

Billie Holiday, “Strange Fruit,” 1939. “Southern trees bear a strange fruit/Blood on the leaves and blood at the roots.” That’s the opening of this haunting ballad, which deals with the horrors of lynchings, which were not-so-distant history in 1939. The song was banned by some radio networks as too controversial.

“Suit & Tie” by Justin Timberlake featuring Jay-Z enters the Hot 100 at #84, based on just two days of airplay (and no sales activity). It’s likely to vault into the top five next week. It will probably debut at #1 on Hot Digital Songs, with first-week sales in the 330K range.

It’s will become Timberlake’s 20th top 10 hit on the Hot 100 (counting *NSYNC hits); Jay-Z’s 19th. Jay-Z first hit the Hot 100 in April 1996 with “Ain’t No Nigga,” featuring Foxy Brown. Timberlake first charted with *NSYNC in March 1998 with “I Want You Back.”

This is the first single from Timberlake’s third solo album, The 20/20 Experience, which is expected to be released in March. Timberlake’s 2002 solo debut album, Justified, reached #2 on The Billboard 200 and spawned two top 10 hits. His 2006 sophomore album, FutureSex/LoveSounds, spent two weeks at #1 and spawned four top 10 hits, three of them #1s.