Been to a Mark Knopfler concert yesterday. It was breathtaking display to Guitar Mastery 
! I was lucky enough to find a first row position in the crowd for about 50,000 
.
One thing I noticed yesterday was how time and again Mark Knopfler goes into this zen like zone while doing his jams! That got me curious so I googled about the pshycology of getting to the zone, I found some articles like "In the Zone" ,"Flow" also "Psychology Tips for Entering the Zone".
"the merging of action and awareness in sustained concentration on the task at hand" - Daniel Goleman, in The Meditative Mind: