In 2000, Zayar Thaw's band Acid released Burma's first hip-hop album. Despite predictions of failure by many in the Burmese music industry, the album, Beginning, remained in the number one position of the Burmese charts for more than two months. A Democratic Voice of Burma reporter described his music as blending a "combative, angry style with indigenous poeticism". The band's repertoire has been said to contain many "thinly veiled attacks on the regime". The Independent stated that while the band "focused on the mundane, their lyrics inevitably touched on the hardships of life in Burma, drawing them into dangerous territory." Zayar Thaw also became known early on for his social activism. At one concert, he teamed with poets Saw Wai and Aung Way to raise money for a charity for HIV-positive orphans founded by the comedian Zarganar. Along with fellow rapper Nge Nge, Zayar Thaw also visited Zarganar's orphanages to help teach English to the children.
Zayar Thaw is one of four founding members of Generation Wave, a youth movement opposed to the State Peace and Development Council, Burma's military rulers. The group was founded on 9 October 2007, following the anti-government protests popularly known as the Saffron Revolution, and used graffiti and pamphlets to spread pro-democracy messages. Zayar Thaw reportedly developed one of the group's more widespread campaigns, bumper stickers reading "Change New Government" to apply to cars carrying "CNG" stickers. The group also circulated anti-government films, including Rambo, in which the titular character battles Tatmadaw soldiers in Karen State. The film had been banned by the government for portraying the SPDC and its soldiers in a negative light. As of February 2010, about thirty members of the group had been imprisoned, including Zayar Thaw, who was arrested at a Yangon restaurant with friends on 12 March 2008. In April, Zayar Thaw's Acid co-founder Yan Yan Chan was also arrested.
Trial and imprisonment
Zayar Thaw was allegedly beaten during his interrogation. On 20 November 2008, he was sentenced to five years' imprisonment for breaking State Law and Order Restoration Council Law No. 6/88, "illegal organizing under the Unlawful Association Act". Amnesty International described this statute as "a vaguely worded law whose sweeping provisions can be interpreted as making it illegal to set up any kind of organization". He was given an additional year's imprisonment for possession of foreign currency, as he had been carrying approximately $20 USD in Thai baht, Singapore dollars, and Malaysian ringgit at the time of his arrest. Before his sentencing, Zayar Thaw told reporters, "I feel sad, but not because of my imprisonment... I feel sad for the future of our country and people when I think about these facts. These words come from my heart. I wish to say to people, 'Have the courage to reject the things you don’t like, and even if you don’t dare to openly support the right thing, don’t support the wrong thing.' " His sentence was condemned by Amnesty International, who named him a prisoner of conscience and called for his immediate release.