Bruno Mars is the leader of the pack in 2015…

Nielsen Music has released its 2015 mid-year music charts with the 29-year-old part-Puerto Rican singer-songwriter’s collaboration with Mark Ronson, “Uptown Funk,” the top-selling digital single.

Mars and Ronson’s ultra-catchy track claimed the top spot, with 4.89 million downloads. However, that number pales in comparison to the amount of times the single has been streamed: Combined audio and video streams of “Uptown Funk” have nearly reached the 368 million mark.

The track was also been a favorite among radio programmers, racking up 646,000 plays in 2015 so far.

Since the beginning of 2015, audio streaming is up 74 percent compared to the same period in 2014, while video streaming has grown an eye-popping 109 percent. From December 29th to June 28th, over 135 billion songs were streamed, the Nielsen report states.

Ed Sheeran’s “Thinking Out Loud” came in second place with 3.45 million downloads, and Wiz Khalifa and Charlie Puth’s “See You Again” (from “Furious 7″) finished at No. 3 with 3.07 million downloads so far this year.