Jamrud are an Indonesian rock & heavy metal band from Cimahi, West Java, Indonesia. They are notable as one of the most successful rock bands which known to bring rock music as popular music in Indonesia in the 1990s. Their fourth studio album, Ningrat, has sold 2 million copies in Indonesia only, this making it the #7 highest selling album in Indonesia as well as the fourth best selling rock album in Indonesia. Between 1981 and 1984, lead guitarist Azis Mangasi Siagian, bassist Ricky Teddy, keyboardist Ari Suwignyo, drummer Budhy Haryono, twin vocalist Robby Matulessy and Guntur Simbolon, and rhythm guitarist Arnold "Yudi" Suryadinata formed a band called Jam. In January 1984, Guntur decided to leave Jam. Due to the individual members' busy schedules, the band went on hiatus for several months. Still in January 1984, Azis, Ricky, Ari, Budhy Haryono, Robby, and Yudi reactivated the band. Not long after, Azis met music producer Log Zhelebour. Log agreed to manage them on the condition that the name "Jam" be changed, as it was considered too Western-sounding. Log then proposed the name "Jam Rock," since January 19, 1984, reasoning that "rock" symbolized hardness. From Wikipedia (https://en.wikipedia.org/wiki/Jamrud_...) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/b...)