[quote=@Genni]
Bursting into an epic guitar solo Rocksmith raised the spirits of the team before collapsing in exhaustion, unable to play another note until he's relaxed a little.
[/quote]

Using skills like that doesn't actually tire him out. When Rocksmith uses a skill, it causes his guitar to heat up. The energy meter is actually a representation of how long he can safely use skills that heat up his guitar before he has to stop to let it cool down.