Who is the composer of the studio album "on the rock" and a Grammy award winner?
Andrés Calamaro Andrés Calamaro (Andrés Calamaro Masel, August 22, 1961), is an Argentine musician, composer and Latin Grammy winner. His former band "Los Rodríguez" was a major success in Spain in the 1990s. He is multi-instrumentalist and he became one of the main icons of the Argentine rock and has sold over 1.3 million copies.
Robert Lopez Robert Lopez (born February 23, 1975) is an American songwriter of musicals, best known for co-creating "The Book of Mormon" and "Avenue Q", and for composing the songs featured in the Disney animated film "Frozen". He is the youngest of only twelve people who have won an Emmy, a Grammy, an Oscar and a Tony Award, and the quickest (10 years) to win all four.