Romero was a prolific composer, creating a wide range of music, such as Caribbean, Jazz, Venezuelan waltzes, including works for orchestra, orchestra and soloist, orchestra and choir, chamber music, up to symphonic works of great dimensions. In 1951 Romero signed contract with RCA Victor to record with a full orchestra, what was to be a very successful album in the "Dinner In..." series, featuring popular Latin American music. Under the RCA label he published his LP Dinner in Caracas, with which beat all sales records in South America until then. Afterwards, recorded numerous LP albums in different countries. In America, his ability as arranger/conductor led him to collaborate with popular orchestras and singers, such as Dean Martin, Jerry Lee Lewis, Stan Kenton, Machito and Tito Puente, among others. He also toured extensively, performing in numerous countries: Mexico, Puerto Rico, Colombia, Peru, Brazil, Argentina, Spain, France, Greece, Switzerland, Sweden, Italy, Russia, Egypt and Japan. Romero was the creator of a new form of Venezuelan music, known as "New Wave" (Onda Nueva), derived from the joropo and influenced by Brazilian Bossa Nova. He also had an important role in the field of learned music.
Aldemaro Romero died in Caracas on September 15, 2007, at the age of 79.