Two tracks have sold over 5 million downloads over the first six months of the year:  GOTYE'S "Somebody I Used to Know" and FUN'S "We Are Young".  Before this year, no song had ever sold 5 million downloads in the first half of a calendar year.  Last year, KATY PERRY'S "E.T." and ADELE'S "Rolling in the Deep" became the first tracks to sell over 4 million.

Here are the Top 20 Digital Songs and their 2012 sales totals:

1.)  "Somebody That I Used to Know",  Gotye featuring Kimbra . . . 5.5 million copies

2.)  "We Are Young",  Fun featuring Janelle Monae . . . 5.1 million copies

3.)  "Call Me Maybe",  Carly Rae Jepsen . . . 4.1 million copies

4.)  "Stronger (What Doesn't Kill You)",  Kelly Clarkson . . . 3.3 million copies

5.)  "Starships",  Nicki Minaj . . . 3.2 million copies

6.)  "Payphone",  Maroon 5 featuring Wiz Khalifa . . . 3.1 million copies

7.)  "Glad You Came",  The Wanted . . . 2.892 million copies

8.)  "What Makes You Beautiful",  One Direction . . . 2.885 million copies

9.)  "Wild Ones",  Flo Rida featuring Sia . . . 2.8 million copies

10.)  "Boyfriend",  Justin Bieber . . . 2.6 million copies

11.)  "Set Fire to the Rain",  Adele . . . 2.5 million copies

12.)  "Sexy and I Know It",  LMFAO . . . 2.13 million copies

13.)  "Drive By",  Train . . . 2.1 million copies

14.)  "Part of Me",  Katy Perry . . . 2.08 million copies

15.)  "Young, Wild & Free",  Snoop Dogg and Wiz Khalifa . . . 2 million copies

16.)  "Rack City",  Tyga . . . 1.93 million copies

17.)  "Turn Me On",  David Guetta featuring Nicki Minaj . . . 1.87 million copies

18.)  "The Motto",  Drake featuring Lil Wayne . . . 1.8 million copies

19.)  "I Won't Give Up",  Jason Mraz . . . 1.7 million copies

20.)  "Good Feeling",  Flo Rida . . . 1.65 million copies

(For more stats on this year's music sales so far, hit up Billboard.com.)