Which of the following describes an advantage that secondary sources have over primary sources for historians

you did not include the choices, but heres a advantage:

usually research is already done, so it proves that it is able to do research on, therefore the historian can carry out more research.  

Explanation:

answer: false. due to the church's swaying authority on common law, it influenced secular music greatly.

explanation:

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate