Stefani Joanne Angelina Germanotta (/ˈstɛfəniː dʒɜrməˈnɒtə/ STEF-ə-nee jur-mə-NOT-ə; born March 28, 1986), better known by her stage name Lady Gaga, is an American singer and songwriter. She initially performed in theater, appearing in high school plays, and studied at CAP21 through New York University's Tisch School of the Arts before dropping out to pursue a musical career. After leaving a rock band, participating in the Lower East Side's avant garde performance art circuit, and being dropped from a contract with Def Jam Recordings, Gaga worked as a songwriter for Sony/ATV Music Publishing. There, recording artist Akon noticed her vocal abilities and helped her to sign a joint deal with Interscope Records and his own KonLive Distribution.
Gaga rose to prominence with her debut album The Fame (2008), a critical and commercial success which produced global chart-topping singles such as "Just Dance" and "Poker Face". A follow-up EP, The Fame Monster (2009), was met with a similar reception and released the successful singles "Bad Romance", "Telephone", and "Alejandro". Her second full-length album Born This Way was released in 2011, topping the charts in more than 20 countries, including the United States, where it sold over one million copies in its first week. The album produced number one single "Born This Way". Her third album Artpop, released in 2013, topped the US charts and included the successful singles "Applause" and "Do What U Want". In 2014, Gaga released a collaborative jazz album with Tony Bennett titled Cheek to Cheek, which debuted at number one in the United States and became her third consecutive number one album in the country.
Gaga is noted for her flamboyant and diverse contributions to the music industry via her fashion, live performances, and music videos. With global album and single sales of 27 million and 125 million respectively, as of June 2014, she is one of the best-selling musicians of all time. Her achievements include six Grammy Awards, 13 MTV Video Music Awards, and 13 Guinness World Records. She regularly appears on Billboard's Artists of the Year lists and Forbes's power and earnings rankings, and was named one of the world's most influential people by Time in 2010. In the same year, Billboard named her the Artist of the Year. Outside of her music, she is noted for her philanthropic endeavors and activism for LGBT rights.