Twin sisters Miko Bai and Yumi Bai make up Singaporean duo By2. That sisterly bond has certainly underlined their seamless duets. By2 made their Mandopop debut in 2008 with NC16, an album of super fun and colourful pop numbers. The following year, the duo released "Don't Go Away", an emotionally honest track from their sophomore album, Twins—which made it into the opening credits for the Taiwanese airing of Korean series East of Eden. In 2010 the sisters made a major impact on the Chinese pop scene with Grown Up, an album that introduced a more matured sound. Our playlist travels the spectrum.