When it comes to writing top 10 hits, it appears that the more songwriters you have, the better. That’s because the average number of songwriters for the top 10 streaming hits of 2018 in the U.S. was a whopping 9.1, according to research done by Music Business Weekly based on information stored in the ASCAP and/or BMI databases.
Source: How Many Songwriters Does It Take To Write A Hit? 9.1