MANILA — Long-time fans of South Korean pop or K-pop were both thrilled and nostalgic after learning that the members of the now-defunct group 2NE1 got together Friday to celebrate the 10th anniversary of their debut.

In May 2009, the quartet released its first single, "Fire," an edgy electronic pop and hip-hop song with an addictive hook.

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That same year, K-pop continued to expand its reach outside Northeast Asia, to listeners across Asia and in other parts of the world. Many groups from this period, dubbed by fans as the "second generation," paved the way for K-pop's global recognition and remain relevant in the industry until this day.

• 'You are still here with us': Sandara pens heartfelt message for 2NE1 fans

On the occasion of 10 years of "Fire," here are 8 other songs released the same year by iconic "second generation" acts.

Even those who do not listen to K-pop may recognize some of these tracks as they infiltrated local airwaves back then.