By the late 1990s, electronic influences became evident in dance-pop music; Madonna's critically acclaimed and commercially successful album "Ray of Light" (1998) incorporated techno, trance and other forms of electronic dance music, bringing electronica into mainstream dance-pop. Additionally, also in 1998, Cher released a dance-pop song called "Believe" which made usage of a technological innovation of the time, Auto-Tune. An audio processor and a form of pitch modification software, Auto-Tune is commonly used as a way to correct pitch and to create special effects. Since the late 1990s, the use of Auto-Tune processing has become a common feature of dance-pop music.