Shooting with a film camera is easy. Shooting with a manual focus lens is easy. Shooting a concert in a brightly lit area is easy.
Shooting a concert with a manual focus lens onto film is difficult. Very difficult. I cannot begin to imagine how concert photographers back then did it. Probably sat and waited for one good shot.
Here is a prime example, an energetic accordion player at a local folk fest, shot in B/W on BW400CN film with the Nikon F3HP using a manual focus 135mm f/2.8 lens. Not sure I nailed the focus however. Nonetheless I am pleased with the shot. I will be doing more folk fest work tomorrow, but I'll be going back to digital cameras and auto-focus lenses.