Why did Tennessee need a new constitution after the Civil War?

Tennessee's Constitution of 1870 was ratified in the wake of the Civil War and codified basic changes from that defining event in American history. ... Delegates were driven by fear of an arbitrary executive and sought a Constitution that would guard against such abuses and excesses of state government from recurring.

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