The Indonesian world music recording "Engkau Bukan Milikku" features a female vocalist singing in a high register, accompanied by a full band. The song opens with a prominent keyboard melody, which is then joined by a male vocalist providing backing harmonies. The arrangement includes a guitar playing a rhythmic, strummed pattern, while a bass guitar provides a foundational, walking line. A drum kit maintains a steady, mid-tempo beat throughout the piece. The male backing vocals are layered beneath the lead female voice, creating a call-and-response dynamic in certain sections. The keyboard takes on a more improvisational role during instrumental breaks, offering short, melodic fills that complement the main vocal line. The guitar shifts between rhythmic strumming and single-note melodic phrases, adding texture and counterpoint to the overall sound. The bass guitar maintains a consistent, supportive role, anchoring the harmony and rhythm.