He is the author of classic songs of the time such as Caprichito, Sueña (with Franz Benko), Al pasa que tiempo (with Hugo Beiza), Ser, Como una sombra and Entre la arena y el mar, among others.

Later, he became a music producer, working on various Chilean television programs (including the Festival de Viña del Mar), together with bands such as Sol y Medianoche, in its beginnings (1981).

Later, together with his friends and also comedians Fernando Alarcón and Eduardo Ravani, they formed the comedy trio "Los Paparazzi", and were in charge of the direction and production of Dingolondago (TVN, 1976-1978), presented by Enrique Maluenda.

In it, Pedreros developed his acting streak, playing well-remembered characters such as Evaristo Espina (true archetype of the servile employee who wants at all costs to win the appreciation of the boss), the radio host Silverio Silva, El operado (a post-operative patient whose friends make him laugh excessively) or El indio bolsero (a tough North American Indian who always ends up asking for food), among others.

In his first year out of Jappening, he was part of the program Éxito on Channel 13, in the section "La Oficina de Al Lado" where he once again played the role of Evaristo Espina.