Koes Bersaudara (Koes Brothers) formed in Jakarta, Indonesia in 1960. At the beginning, the group consisted of 5 Koeswoyo brothers – Jon, Tonny, Nomo, Yon and Yok. After their first album was released in 1964, older brother Jon quit reducing the group to a four-piece. Tonny (lead guitarist and songwriter) was the leader of the group with Yon (rhythm guitar) and Yok (bass) handling the vocals along with Nomo on drums.

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