Simarro has been contracted as a live musician, arranger or producer for Nena Daconte, Manu Tenorio, Julio Iglesias, Dúo Dinámico, Bertín Osborne and José Vélez and similar artists.
His film composition credits include New Dominican Yorker (Daniel Melguiz), The land of the Lapping Death and Obsesión 42.195 (Roberto Carrasco).
After composing some pieces and covers for different TV programs, in 2006, altogether with Javier Gúrpide, he releases his ballets El Equilibrista and La Malaventura (edited by RTVE Música recording company).
[11] The organization's aim is support of the sustainable development of people and nations, working against poverty, and providing culture inspirational and a source for social change.
[13] In 2013 he premiered his first solo album, Juan Antonio Simarro, under the seal of his own music producer, Análogica Producciones S.L..[14] During 2013 and 2014, he toured different countries in Europe and the Americas (Madrid, Moscow, Ukraine, Belarus, US, Venezuela, etc.)
Among his masterpieces we find his passionate Cadiz, Symphonic Poem,[7] recalling an unequivocal Spanish sound, and his intense and romantic Adagio for violin, piano and orchestra.