Roberto Fidel Ernesto Sorokin Esparza (born June 14, 1973, in Rosario, Santa Fe), who performs under the stage name Coti, is an Argentine singer-songwriter, best known for collaborations with other Spanish-language artists like Andrés Calamaro, Julieta Venegas, Natalia Oreiro and Luis Miguel in his last album. His 2005 release, Esta Mañana y Otros Cuentos went gold in both Argentina and Mexico, while going double platinum in Spain.