Oscar Valdambrini was born in Turin on May 11, 1924, and died in Rome on December 26, 1996, at 72. He is best known as the trumpeter of the Basso-Valdambrini Quintet, which he co-founded and co-led for two decades with tenor saxophonist Gianni Basso; Discogs' own historical note on the group calls it one of the most famous ensembles in the history of Italian jazz, and The New Grove Dictionary of Jazz credits Valdambrini with a central role in the emergence of Italy's modern jazz movement.

He began on violin at the Turin Conservatory, studying under Enrico Pietrangeli from 1934 and taking his diploma in 1941, and started trumpet in parallel from 1936 under Emanuele Giudice. According to a Treccani biographical profile, a jam session with the visiting American cornetist Rex Stewart in the late 1940s turned him toward jazz as a career. He moved to Milan, and in 1955 formed the Sestetto Italiano and then the Basso-Valdambrini Quintet with Basso, adding alto saxophonist Attilio Donadio; the group expanded to a sextet or octet as engagements required and continued, through several personnel changes, into the 1970s.

The quintet's core recordings are confirmed at the Discogs credit level. Basso Valdambrini Quintet (Music, 1959) has Valdambrini's trumpet fronting the group with pianist Renato Sellani, bassist Giorgio Azzolini and drummer Gianni Cazzola. New Sound From Italy (Jolly Hi-Fi, recorded in Milan in December 1959) enlarges the group to an octet with Donadio, Glauco Masetti, the Swedish baritone saxophonist Lars Gullin, trombonist Mario Pezzotta and bassist Franco Cerri. Walking in the Night (RCA, 1960) and Basso Valdambrini Plus Dino Piana (Jolly, 1960) followed; the latter brought valve trombonist Dino Piana into the group as its third horn. Bossa Nova! (Ricordi, 1963) added Cerri's guitar and a Brazilian repertoire, and the quintet continued to record for Fonit and Cetra through 1970, with Stella By Starlight (recorded 1970-1971, released 2009) capturing a later edition of the group with drummer Gil Cuppini.

Valdambrini and Basso also backed visiting American musicians. In 1961 the quintet recorded Buddy Collette In Italy (Ricordi) with the Los Angeles reedman Buddy Collette. Biographical sources including the Saint Louis jazz-school archive and English Wikipedia (citing The New Grove) additionally credit Valdambrini with work alongside Duke Ellington, Lionel Hampton, Maynard Ferguson, Freddie Hubbard, Mel Lewis, Frank Rosolino, Kai Winding, Chet Baker and singer Helen Merrill; none of these is independently confirmed at the Discogs session-credit level for Valdambrini specifically, and they are stated here as biographical record rather than verified discography.

Valdambrini was also one of the group's composers: his original tunes "Lotar," "Walking in the Night," "Il Grimmo" and "Chet To Chet" are Discogs-credited Written-By entries on the quintet's RCA and Jolly releases. Under his own name he recorded intermittently as a leader, from early singles for Durium and Fonotil through Oscar Valdambrini Is A "Trumpet in the Night" (Beat Records Company, 1985) with the Walter Rizzati Orchestra, and Con Alma (Dire, 1980), a large-ensemble session for a Manuel and Christian De Sica film project that also featured pianist Enrico Pieranunzi, drummers Fabrizio Sferra and Roberto Gatto, and trumpeters Franco Piana and Cicci Santucci alongside his own trumpet.

As the original quintet's work slowed, Valdambrini formed a second long partnership with trombonist Dino Piana. The Sestetto Dino Piana E Oscar Valdambrini recorded 10 Situazioni (1973), the soundtrack for the RAI television mini-series Serata Al Gatto Nero, with bassist Giorgio Rosciglione, and the pairing continued as the Piana-Valdambrini Sextet into the late 1980s. Valdambrini also recorded as a leader with Piana on Jazz A Confronto 34 (Horo, 1976), a Rome session that included bassist Bruno Tommaso and pianist Enrico Pieranunzi, and the pair are heard together again as part of the RAI orchestra's own library recording Quelli Della TV (Fonit Cetra, 1976).

From 1972 Valdambrini held a trumpet chair, eventually the solo trumpet position, in the RAI orchestra in Rome, and his instrument is documented across two further decades of Discogs sideman credits: film-score sessions for Ennio Morricone (including a compiled anthology of Morricone cues, Antologia Di Musiche Da Film Scritte Da Ennio Morricone Per Oscar Valdambrini, 1982) and Piero Umiliani, library-music and RAI orchestra dates, and a 1971 credit in the Giorgio Gaslini Bigband's Newport In Milan, alongside saxophonists Eraldo Volonté and Gianni Bedori and drummer Franco Tonani. He declined in health from the mid-1980s and died in Rome on December 26, 1996.

Valdambrini's trumpet is usually described as the more animated counterpart to Basso's cooler tenor saxophone: a Treccani biographical assessment describes his soloing as marked by "controlled fire, melodic-rhythmic variety, and a lyricism infused with nervous rhythmic energy." Discogs tags the quintet's core recordings Bop and Cool Jazz (Blues For Gassman, the compiled 1959-1960 sessions), Hard Bop and Modal (Walking in the Night, Basso Valdambrini Plus Dino Piana), and Post-Bop and Contemporary Jazz on the later Stella By Starlight sessions, tracing the same arc from cool-toned bebop toward a harder, more modern language that the group's American engagements (Buddy Collette, and the biographically reported but unverified encounters with Ellington-orbit and bebop-era musicians) suggest.

Alongside that jazz identity, Valdambrini's long RAI orchestra tenure and his extensive film and library-music session work put him in the same working pattern as several of his quintet colleagues: a jazz improviser who also earned a living as an orchestral and studio trumpeter, playing Ennio Morricone's film themes and light-orchestra repertoire (his own singles include an easy-listening version of the trumpet standard "Il Silenzio") alongside his own quintet's bebop and cool-jazz book.