Hadn't noticed that - but you might be right.
This show had 5 guest spots on 4 songs: The Black Keys, Garry Clarke Jr., John Mayer, Bruce, Mick Taylor... all (apart from Mick T.) with (shared) vocals included. That usualy puts a bit more strain on the lead singer then on the rest of the band... and with the Commander, always trying to run the tightest of ships here (contrary to some in the
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