The foremost objective of this doctoral thesis is an attempt at shedding some light onto a practically unknown part of the twentieth century insofar as the origins and development of jazz in the city of Valencia, up to a date set according to specific criteria explained in the Introduction of this work. We have followed methodology criteria obtained from each of the time frames considered [by decade: from 1927 until the end of 1981] with a view to linking (after thorough research in newspaper libraries) socio-cultural references from the city with personal input from musicians, relatives and relevant members of the local jazz scene. We start with the opening of the Hot Club in Valencia, continuing with the significant musical achievement of Perdido Club de Jazz. We have also considered the addition of dates to the first jazz bills in the city as well as the setting up of appropriate structures, such as the circulation of scores and the phonograph, the first jazz schools, tools of the trade for musicians exposed to the arrival of the first jazz themes, all of which helped to consolidate the new genre amongst a minority of our musicians. Some hitherto unknown characters from the Valencian musical scene are mentioned in this work as key factors in the spread of this new musical style. However, their work has not been duly acknowledged. In addition to this historical component, this thesis contains specific musical sections, mainly analytical: works and arrangements of standards. It contains contextualized references on how the jazz phenomenon becamed locally established. We have aimed to shine some light onto names , dates and figures which have remained in obscurity for years during the decades when the musical scene in Valencia was dominated by variety, ballroom and ‘la copla’, popular music very far removed -both in content and form- from the jazz which was developing throughout the western world.