Wow! Max Martin scored his *20th* No. 1 single as a songwriter on the #Hot100 with @TaylorSwift13's "Bad Blood" http://t.co/dTtYbZ6kbR
— billboard (@billboard) May 28, 2015
His 20 #1s:
1999 - "...Baby One More Time" (Britney Spears)
2000 - "It's Gonna Be Me" ('N Sync)
2008 - "I Kissed a Girl" (Katy Perry)
2008 - "So What" (P!nk)
2009 - "My Life Would Suck Without You" (Kelly Clarkson)
2009 - "3" (Britney Spears)
2010 - "California Gurls" (Katy Perry feat. Snoop Dogg)
2010 - "Teenage Dream" (Katy Perry)
2010 - "Raise Your Glass" (P!nk)
2011 - "Hold It Against Me" (Britney Spears)
2011 - "E.T." (Katy Perry featuring Kanye West)
2011 - "Last Friday Night (T.G.I.F.)" (Katy Perry)
2012 - "Part of Me" (Katy Perry)
2012 - "One More Night" (Maroon 5)
2012 - "We Are Never Ever Getting Back Together" (Taylor Swift)
2013 - "Roar" (Katy Perry)
2014 - "Dark Horse" (Katy Perry feat. Juicy J)
2014 - "Shake it Off" (Taylor Swift)
2014 - "Blank Space" (Taylor Swift)
2015 - "Bad Blood" (Taylor Swift)
Source
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Would your fav have a career without the producers/songwriters behind them, ONTD?