Guillermo Martínez has a catalog of more than 100 works and his music has been performed in USA, Russia, Cuba, Austria, UK, Germany, Italy, France, Sweden, Switzerland, Hungary, Lithuania, Ukraine... Among the interpreters of his works are the conductors Joshard Daus, Marzio Conti, Davide Levi, Lucas Macías, Isabel Rubio and a long etcetera. To these are summed the instrumentalists Horacio Lavandera, Iván Martín, Agata Daraskaite, Rolanda Ginkute, Óscar Martín, Marina Solovova and the singers María José Montiel, Natalia Troshina, Beatríz Díaz and David Menéndez to mention just a few. Likewise, Martínez's music has been premiered and performed EuropaChorAkademie, Šv. Kristoforo kamerinis orkestras, Choir and Orchestra Opera of Kyiv, Harper Orchestra, OFIL, OSPA, Janus Orchestra, JOSPA, Ensemble Ars Mundi, Cavatina Vocal Quartet, Psappha Ensemble, Quatuor Danel, KhorikosNY, Coro "El León de Oro", Banda “Ciudad de Oviedo”, Banda Sinfónica Municipal de Sevilla... Guillermo Martínez has received awards, his work has been published (sheet music/CD/DVD) and broadcasted (radio/TV) in America and Europe.