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By Edna Gundersen, USA TODAY

Justin Timberlake, Macklemore & Ryan Lewis, Bruno Mars, Pink andMumford & Sons are at the front of the pack in the music sales raceat the 2013 midpoint, according to Nielsen SoundScan.

In the tracking period ending June 30, Justin Timberlake's The 20/20 Experiencestands as the year's biggest-selling album, with just over 2 millioncopies. No other title has passed the 2 million mark this year. Thealbum bowed in Billboard at No. 1 in March with 968,000 copies, still the year's biggest sales week.

Bruno Mars' Unorthodox Jukebox, released in December, is second with 985,000. Mumford & Sons' Babel,which entered the chart at No. 1 in October with 600,000 copies andsold 1.46 million copies by the end of 2012, is third after selling anadditional 884,000 copies. Babel gained momentum after winning best album at the Grammy Awards. Blake Shelton's Based on a True Story ... ranks fourth with 703,000, followed by Imagine Dragons' Night Visions with 692,000.

Macklemore & Ryan Lewis top the digital songs list with 5.56 million downloads of Thrift Shop, the fastest-selling song of any calendar year's first six months, according to Billboard. It breaks the record set last year by Gotye's Somebody That I Used to Know, which sold 5.5 million downloads by mid-2012.

Pink's Just Give Me a Reason is a distant No. 2 (3.5 million), trailed by Bruno Mars' When I Was Your Man (3.4 million), Rihanna's Stay (3.3 million) and Imagine Dragons' Radioactive (3.2 million).

Consumers have downloaded 682 million digital tracks so far this year, down 2% from 2012. Album sales dipped 6% to 142 million.

The rankings and sales trajectory could shift dramatically in the year's second half. Jay-Z's Magna Carta Holy Grail arrivesfor purchase Tuesday. Fans are also salivating for confirmed orexpected discs by John Mayer, Kings of Leon, Beyoncé, Eminem, JenniferLopez, Katy Perry, Lady Gaga, R. Kelly, Psy, the Black Keys and BritneySpears. And there's Timberlake's sequel, The 20/20 Experience (2 of 2).

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