Who wrote the most #1 hit singles after paul McCartney and Lennon 🎻?

Related questions

1. Which state has the most state songs?
2. Did Ringo sing any songs?
3. What was the original title of yesterday?
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5. Who owns the rights to the Beatles songs now?
6. What is the most sung song in America?
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8. How many times has the song yesterday been covered?
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Tags

1. #mccartney
2. #writer
3. #number
4. #successful
5. #lennon
6. #songwriters
7. #singles
8. #terms
9. #credited
10. #written
11. #lennons
12. #authored
13. #whereas