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Billboard.com just counted down the 20 most successful writers based on Billboard Hot 100 chart performance between Jan. 1, 2000, and May 7, 2011. From pop and rock to R&B and country, each genre is represented. The top five are below. Check out http://www.billboard.com for the complete list. The descriptions are provided by Billboard: 1. Timothy "Timbaland" MosleySong With Most Weeks At No. 1: "SexyBack," Justin TimberlakeTimbaland's Hot 100 career can be defined not just by his staggering chart success, but also by how he become the go-to songwriter and producer in the late 2000s for nearly every pop act in the marketplace. While his early charting hits were mostly with R&B and hip-hop acts like Aaliyah and Missy Elliott, he found an entirely new and stratospheric kind of success with Justin Timberlake and Nelly Furtado in 2006. Thanks to the No. 1s like "SexyBack," "My Love," "Promiscuous" and "Say It Right," Timbaland soon found himself working with everyone from Madonna ("4 Minutes," No. 3, 2008), Shakira ("Give It Up To Me," No. 29, 2009) and Bjork's ("Earth Intruders," No. 84, 2007). 2. Lukasz "Dr. Luke" GottwaldSong With Most Weeks At No. 1: "TiK ToK," Ke4ha (above)Dr. Luke has written 10 Hot 100 toppers since 2000, six with the writer at No. 4 on this list, Max Martin. "Apparently my taste is that of a 13-year-old girl," Dr. Luke joked to Billboard last year. "Not really. But my taste is commercial. Sometimes when I talk to people, they're like, 'What is it like making this simple music?' They look down on it. And I'm like, 'No, you don't get it. I actually like this. I'm trying to make songs that I love and make them feel a certain way and go to certain places. It just so happens that a lot of 13-year-old girls like that." 3. Pharrell L. WilliamsSong With Most Weeks At No. 1: "Hot in Herre," NellyWhile Pharrell would eventually become a familiar face, guesting on tracks by such luminaries as Ludacris, Mariah Carey and Snoop Dogg, he launched his Hot 100 chart career by co-writing Blackstreet's 1995 hit "Tonight's the Night" with his Neptunes partner-in-crime Chad Hugo. Williams really hit his stride in the 2000s, writing hits for Britney Spears ("I'm a Slave 4 U," 2001), Kelis ("Milkshake," 2003), Ludacris ("Money Maker," 2006) and Madonna ("Give It 2 Me," 2008). 4. Martin Karl "Max Martin" SandbergSong With Most Weeks At No. 1: "I Kissed a Girl," Katy PerryMartin wrote several hooky '90s power-pop hits for Backstreet Boys, Celine Dion and 'N Sync, as well as his first No. 1, Britney Spears' "…Baby One More Time." In the 2000s, 11 of Martin's songs have topped the Hot 100, the highest sum on this ranking. He penned Spears' latest leader, "Hold It Against Me," his whopping ninth No. 1 as a writer since Katy Perry reigned with "California Gurls," featuring Snoop Dogg, in 2008. Martin even co-wrote the "Glee" cast's first original Hot 100 hit (No. 6), "Loser Like Me." (Keep reading to see where Martin's other collaborative half ranks on the countdown). 5. Rob ThomasSong With Most Weeks At No. 1: "Smooth," Santana feat. Rob ThomasThe top-ranking rock-based songwriter on the countdown, Thomas wrote Santana's 1999-2000 comeback smash (12 weeks atop the Hot 100) "Smooth," for which he sang lead vocals. With his band matchbox twenty, Thomas added the No. 1 "Bent" (2000). Having released two solo albums since 2005, Thomas has risen as high as No. 5 on his own with "Lonely No More." The future promises to go just as smoothly: "so busy. writing every day," Thomas Tweeted May 18.

Billboard's Top 20 Hot 100 Songwriters, 2000-2011Link: http://www.billboard.com/#/features/top-20-hot-100-songwriters-2000-2011-1005197632.story?page=1

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