SM ENTERTAINMENT:

One of Korea's top entertainment companies. The CEO of SM is Lee-Soo Man. He's a tough guy to impress. So make sure you got the skills and talent worth watching/listening when auditioning. They will take any band as long as you have what it takes.

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JYP ENTERTAINMENT:

Another top entertainment company in Korea. Founded by CEO Park Jin Young. He's a more relaxed guy than Lee-Soo Man. But he is very critical. There is no specific genre of music they play, so they will take almost any band.

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YG ENTERTAINMENT:

One of the top 3 companies in Korea. YG entertainment has been founded by Yang Hyun Suk. YG entertainment usually only takes rock bands. Or any band that has a live 'bad boy/girl' kind of image. 

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More companies to come ^^