Conversation so far:
What happened in MC5's early years?
The origins of MC5 can be traced to the friendship between guitarists Wayne Kramer and Fred Smith. Friends since their teen years, they were both fans of garage rock.
When did MC5 start together after the friendship between guitarists Wayne Kramer and Fred Smith?
Each guitarist/singer formed and led a rock group. As members of both groups left for college or straight jobs, the most committed members eventually united with Vargo and Leo.

Question: What was the improvement they made afterwards?
Self-contained rewrite: What was the improvement MC5 made afterwards with the most committed members eventually uniting with Vargo and Leo?