During the 1950s the Ecuadorian pasillo went through a transition. Although it was still the national music of Ecuador, with the arrival of the radio it was forced to compete with foreign boleros, tangos, waltzes, guarachas, and other styles of tropical music, such as guaracha, merecumbe, and the Ecuadorian-Colombian cumbia. The continued strength of the Ecuadorian pasillo is in thanks to the performances of great singers such as the duet Luis Alberto Valencia and Gonzalo Benítez, the Montecel brothers, the Mendoza Sangurima sisters, the Mendoza Suasti sisters, Los Coraza and Marco Tulio Hidrobo.