Pronto... Pronto!... / El Pullover / Mai Mai Mai Piu (Impazzivo Per Te) / O Dio Mio

Released in 1961 on the Spanish label Belter, this EP by Los Deltas represents the early wave of the twist and rock-and-roll influence in the Mediterranean music scene. The record, catalog number 50.449, captures the band's adaptation of popular international sounds for the Spanish market, featuring a mix of upbeat danceable tracks and romantic ballads that were characteristic of the period's recording industry trends.

The band Los Deltas was part of the burgeoning Spanish pop scene that looked toward Italian and American models for melodic structure and energy. The production reflects the standard mid-century recording techniques of the era, focusing on the vibrant vocal harmonies and tight instrumentation that defined their specific contribution to the Belter catalog. It remains a notable artifact for those documenting the transition of Spanish music into the international pop era.