The most successful Mexican singer of the 1990s was Luis Miguel. Best known for his technically skilled and smooth crooning vocals, Luis Miguel's super-stardom began since the late 1980s. In 1991, his career went to even greater heights and earned him the respect of a wider audience with the release of "Romance", an album of romantic boleros. Most of them were from the 1940s and 1950s. Despite singing boleros from years past, Luis Miguel was recognized for reinventing the bolero for modern audiences. The album "Romance", which became his most successful album ever, eventually sold 15 million units worldwide. Luis Miguel has successfully performed pop music, bolero, mariachi and romantic ballads. He has won four Latin Grammy Awards, five Grammy Awards, and has sold an estimate of 90 million albums until today. He is known in Latin America and Spain as "El Sol de México" (The Sun of Mexico).