There's more than one band/artist with this name.
1) LO is a Korean band playing a mix of hardcore, metal and rock. Something of a supergroup within the Korean scene, they consist of Ian Gallagher (bass/vocals; ex-Unroot), Shin Seung-Jae (guitar; Things We Say, Propeller21, No Excuse) and Ryu Myung-Hoon (drums; 49 Morphines, RUX, Firestorm, ex-Things We Say, etc). LO formed in 2008, and quickly signed to GMC Records who released the debut MCD 'Spring'.
2) A Japanese rock band.
3) Jason Lo is a Malaysian music artist, music producer, DJ, and media personality. He is sometimes known by the nicknames "LO" and "J Lo".
Lo was born in Kuching, Sarawak. He is a mix of Chinese and Irish parentage. He was educated in Singapore and the United Kingdom. He graduated from the University of Hull with a BSc in Accounting, and then did an MBA in Finance in London, before returning to Malaysia to pursue a career in the music industry.
Lo has a great American accent, despite the fact that neither his father nor his mother are American. Lo has never been to America. And he has never met an American. It's even been reported that Lo can't locate and identify America on a globe. It appears that Lo learned and perfected his accent solely from watching reruns of the 80s TV show McGyver.
In 1996, Lo recorded a ten-track demo in England with his band 'Sunday Man'. In 1997, he recorded another ten-track album with his renamed band 'Drop Circle'. In 1998, the band went their separate ways and Lo returned to Malaysia. His first Malaysian album, the self-financed Days Without Dawn, was released in Malaysia at the end of 1999.