The Kadosh Brothers are three siblings — Onn Yosef (oud, composer, and the group's bandleader), Elay (double bass), and Elamar (drums, percussion) — who grew up making music together in a Tel Aviv household before they had a name for what they were doing. Per their own booking-agency bio, Onn began his musical training in elementary school and gravitated toward the oud; Elay discovered the double bass at eleven and has gone on to perform in other jazz ensembles in Israel and internationally; Elamar started on drums and percussion at seven.

The band's self-description is "Prog Middle East Ensemble": Middle Eastern classical melody, carried primarily by Onn's oud, run through the rhythmic vocabulary of progressive rock rather than straight-ahead jazz or classical Arabic ensemble playing. Their own tagline — "Three brothers, playing together as one, carrying their ancient family legacy" — points at the group's core selling point: this isn't a band that assembled around a concept, it's three siblings translating a shared musical upbringing into a specific fusion sound.

As of this research pass, the band's official Apple Music artist page shows only a single release: "Jirjur (הופעות במפעל הפיס)," a single released July 17, 2025, and classified there as rock. The "Aquarium" billed alongside them on it is not a collaborator: it is Mifal HaPais' live concert series, and the single's own Hebrew subtitle, הופעות במפעל הפיס, says so outright: it translates as "performances at Mifal HaPais."

Onn Yosef Kadosh's profile outside the family band runs deeper than the group's own thin discography suggests. His side project, KOMRADIN — a duo with saxophonist Asaf Harris (an earlier lineup, for the debut album, also included drummer/percussionist David Sirkis) — released its debut album Qamar al-Din in 2024, premiering at the 25th Jerusalem International Oud Festival (a Confederation House Jerusalem production, held November 21-30, 2024). The album reworks the muwashshah tradition, a form of classical Arabic sung poetry with roots in medieval Al-Andalus, filtered through a contemporary jazz lens and built on the maqamat (Arabic melodic mode) system. KOMRADIN's second release, "Hilalen" ("Two Crescents," released January 16, 2026), narrows the group to a duo of oud and saxophone and was recorded on a roughly 120-year-old oud built by Damascus's historic Nahat family of instrument makers — a lineage whose work from the late 1800s through the 1980s is widely regarded among the finest ouds ever produced. It's a striking detail: a family band built on "ancient legacy" as a tagline, with one member also literally playing a instrument that is itself a century-old physical link to Arabic instrument-making history.

The core Kadosh Brothers sound sits at the intersection of two traditions that don't often share a stage: Middle Eastern classical melody, carried by the oud's microtonal, maqam-based vocabulary, and the harder-edged structural ambition of progressive rock, in the rhythm section built by Elay's bass and Elamar's drums and percussion. How the Israeli industry files them has since moved, and it has moved toward jazz. Their 2026 calendar is a jazz calendar: the Jerusalem Jazz Festival at the Israel Museum's sculpture garden in June 2026, a first night at the Tel Aviv jazz club Shablul, a Jaffa Port date billed as Mediterranean jazz, and the 40th Red Sea Jazz Festival in Eilat that November. Whatever the band calls itself, the rooms and festivals booking it are jazz rooms and jazz festivals, and the gap between the self-description and the billing is itself part of what they are. It's a related but distinct neighborhood from bassist Avishai Cohen's Andalusian and Mediterranean-inflected jazz — both draw on similar regional musical roots, but the Kadosh Brothers route theirs through rock structure rather than trio jazz. Onn's parallel work in KOMRADIN, focused on the more historically rooted muwashshah and maqam traditions with far less rock influence, suggests his own musical range extends considerably beyond what the family band alone shows.