Who needs electricity to get charged up? Certainly not Live; their sophomore disc, Throwing Copper, finally jumps to No. 1 on the pop chart after a year. Their latest single, ”Lightning Crashes,” continues to rule at album rock radio (where it spent the past six weeks at No. 1), but what most likely threw Copper upward was last week’s MTV debut of Live’s February Unplugged performance. The juice from Sheryl Crow’s Unplugged, on the other hand, has faded; her Tuesday Night Music Club drops out of the top 10, allowing returns by John Michael Montgomery and TLC.