Mamelo Gaitanopoulos, born Orpheus Gaitanopoulos to a Greek-Jerusalemite family, grew up in a musical household: his father Stratis was a pianist and composer who taught him piano from around age seven, and he later studied at a Jerusalem academy under Mel Klar before his professional debut at 17, when the pianist Dani Gottfried invited him to play alongside him. Still a teenager, he found session work on some of the defining Israeli pop records of the era: he plays on "Shablul" (1970), the album that introduced Arik Einstein and Shalom Hanoch's songwriting partnership, appears on Shlomo Gronich's 1971 debut, contributes flute to a Shlomo Artzi record, and is Discogs-credited on flute (billed "Mamello Gaitanopoulos") on the choreographer Moshiko Levy's 1976 dance record Dance With Moshiko. None of this early work is jazz, but it shows a working Israeli session musician's résumé years before his formal jazz training began.

That formal training came after a spell in London in the late 1960s, when Gaitanopoulos crossed the Atlantic to study at Berklee College of Music in Boston, graduating with distinction in 1975 under the jazz-composition and arranging faculty of Herb Pomeroy. He stayed in the United States for sixteen years, based first in Boston and then New York, and it was there that his jazz credentials were built in earnest: as tenor saxophonist and arranger with drummer Charli Persip's Superband, he is Discogs-credited on the big band's In Case You Missed It (Soul Note, 1985, styles tagged Bop and Cool Jazz) and No Dummies Allowed (Soul Note, 1989), and Hebrew-language sources add a third Persip album, Original Superband (1994), that this build could not independently verify on Discogs (see notes.md). He also has a 1977 Discogs credit (backing vocals, one track) on the Latin-jazz percussionist Bobby Paunetto's Commit to Memory, and secondary sources place him alongside organist Jack McDuff, the Mel Lewis Jazz Orchestra, and, on at least one occasion, Dizzy Gillespie, while leading his own nine-piece band in New York.

Gaitanopoulos returned to Israel in 1988 and has stayed active in the jazz scene there ever since, playing the Red Sea Jazz Festival and the Tel Aviv Jazz Festival on a regular basis. In 1997 or 1998 he toured India with Dani Gottfried's quintet under a Foreign Ministry cultural program and played the Rome Jazz Festival the same trip; in 1998 the WDR Radio Orchestra in Germany recorded his composition "The Song of Thirds." His own nonet had a well-reviewed set at the Red Sea Jazz Festival in 2007, and in 2010 he released Mamelo Gaitanopoulos Quartet, Live at the Shablul Jazz Club, a self-produced live recording from Tel Aviv's Shablul Jazz Club (not Discogs-indexed; see discography-full.md). Since finishing his own studies, he has taught bebop improvisation and led the Blue Note ensemble at the Rimon School of Jazz and Contemporary Music, given private trumpet lessons there, and taught at the Jerusalem Academy of Music and Dance (the Rubin Academy).

He has kept performing into his eighties: in December 2016 his sextet, with saxophonist Ofer Shapira, trombonist Oded Meir, pianist Igor Khodorkovsky, bassist Assaf Hakimi, and drummer Gideon Pesahov, toured Israel with a set of original arrangements of songs from Porgy and Bess, alongside the vocalist Deborah J. Carter, playing the Jerusalem Theater, Zappa Herzliya, and the Tel Aviv Museum of Art; a version of that same "Porgy and Bess" sextet show was still being booked as of 2022. More recent quartet dates have paired him with the vocalist Shelly Saraffi on jazz standards, and an open-air quartet set at Tel Aviv's Station Park (with Igor Khodorkovsky, Yonatan Levi, and Yonatan Rozen) shows him still gigging regularly on the city's jazz circuit. In 2014 he also guested on "Cup of Coffee," a track by the Jerusalem group Naam Ensemble, composed by Noam Bartov for their album Istiftach.

Gaitanopoulos's career runs on a contradiction that turns out not to be one: a Greek name and heritage inside a musician who has never lived anywhere but Jerusalem and, for sixteen years, the American cities where he learned to play jazz. His own account of his influences names American jazz alongside Argentine tango, African melody, and Moroccan folk material, a mix he attributes directly to growing up in Israel's own layered musical environment rather than to any single lineage. His most heavily documented period, the Charli Persip Superband years, sits squarely in hard-swinging big-band bebop and cool jazz (the Discogs style tags on In Case You Missed It read "Bop" and "Cool Jazz"), while his one other verified 1970s New York credit, on Bobby Paunetto's Commit to Memory, comes from a Latin-jazz and Afro-Cuban date, a different, more percussive register from the Persip big-band charts. His own working bands since returning to Israel, the 2007 nonet, the 2010 quartet, and the 2016 sextet's Porgy and Bess arrangements, put him back in the arranger's chair he trained for at Berklee, writing for larger jazz ensembles rather than only soloing in them. Alongside that jazz career sits a genuinely separate, decades-older strand of Israeli session work (the 1970s Arik Einstein, Shalom Hanoch, Shlomo Gronich, and Shlomo Artzi credits, and the 1976 Moshiko dance record), work this profile discloses rather than folds into his jazz discography, since none of it is jazz by any Discogs genre tag or by his own stated Berklee-era turn toward the music.