Who is the composer of the studio album "on the rock" and a Grammy award winner?
On the Rock: On the Rock is the 20th studio album by Argentine singer-songwriter Andrés Calamaro, released on June 1, 2010. Andrés Calamaro: Andrés Calamaro (Andrés Calamaro Masel, August 22, 1961), is an Argentine musician, composer and Latin Grammy winner.
Andrés Calamaro