U2's new single, "Get on Your Boots," scored massive audience numbers throughout Europe and the United Kingdom on its debut day of radio airplay yesterday (Jan. 19), according to Nielsen Music Control.

Arriving on the second day of the airplay-monitoring week, the new single shot straight to No. 1 on Ireland's airplay chart and No. 4 in the U.K., with total audiences of two million and 12.5 million respectively.

The song also fared well in Germany (78 million), Italy (11 million) and Austria (10 million), despite arriving near the end of the European monitoring week. Belgium and Holland showed a promising start with respective audiences of 3.5 and 2.6 million.

In the United States, "Boots" received 529 total spins, according to Nielsen BDS. KYSR-Los Angeles played it 24 times, while KENZ-Salt Lake City was second with 18.

"Get on Your Boots" was unveiled simultaneously around the world at 8:15 a.m. GMT yesterday. Originally U2 had announced the song would not be available digitally until Feb. 15, but it went live yesterday via Apple's iTunes Music Store in the United States.

The band's forthcoming album, "No Line on the Horizon" will be released March 2 through Mercury/Universal in the U.K. and the following day in North America through Interscope/Universal.