Billboard looks back and counts down the top five songs that ruled the summer of 2009.

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15 years later, our first artist is still on top of the world, but it was one of her early hits that made it into our top five. Taylor Swift comes in at No. 5 with “You Belong With Me.”

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We swing the pendulum the other way with the next song on the list, from pop country to rap. Coming in at No. 4 — Drake’s “Best I Ever Had.”

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Keri Hilson had a huge hit on her hands when she brought in some big names to join her on her debut album. Her song “Knock You Down” featuring Kanye West and Ne-Yo comes in at No. 3.

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2009 was the year of the Black Eyed Peas. Their huge hit “Boom Boom Pow” lands at No. 2 from their fifth studio album, The E.N.D.

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And the No. 1 song. The 2009 song of the summer also belongs to the Black Eyed Peas.

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You know it already from two little notes. “I Gotta a Feeling” had us fist pumping and jumping up and down to the electronic beats the second it came on.

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Do you remember these? Which one had you dancing away the hot summer days of 2009?