Surely more than one has asked this, or worse, by the fact that fans, are we asked, and we are in the uncomfortable situation where you do not really know what it is. Many simply respond "Poker Face" or "Bad Romace" but in reality most of the singles from Gaga have something to boast about, and here we will go over this. "Just Dance" sold over 11 million copies and stayed at number one on the Billboard Hot 100 for four weeks. It was voted by Americans as the song you can never miss in a nightclub. "Poker Face" holds the record as the most downloaded song in history by a woman with an estimated 15 million copies. "Bad Romance" also accumulated some 14 million copies, has been covered by many artists, their music video is considered one of the best in the history and variety of awards received, highlighting the Grammy. Meanwhile, "Telephone" is one of the most successful female collaborations of all time, while "Alejandro" was the first radio hit in Latin America Gaga. "Born This Way" is the song with the most number one with a total of 25, coupled with its almost 10 million copies worldwide. In addition to critical acclaim, "The Edge of Glory" was one of his most versioned and radiated songs. "Yoü and I" was also acclaimed for its melody rock n 'roll and country. It was voted by U.S. truckers as his favorite song. Finally, "Applause" has had a significant impact on popular culture, has sounded in many important events such as the closing of the Victoria's Secret at different football games in the United States in celebrating new year in your country as Australia, France, Sweden and many more. Not to mention the radiated Career Gaga song. So what is the most successful song of Gaga? By sales, you could say that "Poker Face" impact "Bad Romance" for amount of number ones "Born This Way" and general reception "Applause".