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1999 was the year that the following songs were all released:
1. Mambo No. 5
2. All Star
3. Smooth
4. Nookie
5. Everybody's Free (to Wear Sunscreen)
6. Steal My Sunshine
7. Thong Song
8. All the Small Things
9. Livin' The Vida Loca
10. My Name is
On top of all this, the top 2 Billboard Hot 100 singles were
Believe, by Cher
and No Scrubs, by TLC