My money's worth was the Grateful Dead at Folsom Field in Boulder. CO. in 1973. 5 hours of music for 6 dollars.
$6

Now that's what I call a deal! I never was a "Dead Head", but you can't help but love their music. I mean, they
were the prototype for modern jam bands. Ya' gotta love "Casey Jones", "Ripple", "Truckin'", and my personal favorite, "Help on The Way".
Swoop