Taylor becomes first artist to Top Billboard song chart in the last 3 decade

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If we count the Radio songs chart that existed back in the the 80s, we could say Janet also did it:

 

80s: "When I Think of You", "Miss You Much"

90s: "Escapade", "Come Back to Me", "Love Will Never Do (Without You)", "That's the Way Love Goes", "Again"

00s: "All For You"