Witness the fact, one member of this Jazz musical group takes his hearing seriously enough to wear ear protection (light orange ear plugs) while performing with the troupe.
According to health authorities, playing loud music can have serious health implications like deafness because of sound level and duration being exposed to it.
The same is true for the fans listening to the loud music, who more than likely, are blasted by sound from the huge loudspeakers placed near the stage and set at maximum level.
Notably, those “rock” and “heavy metal” concerts are probably the worst offenders that destroy many loyal fans hearing producing generations of deaf adults in their wake.
The sax player in middle, forefront is also protecting his eyes from the very bright sun during the very bright and sunny July day when playing at the Heineken Place beer tent during the recent 2016 Montreal International Jazz Festival.
This my contribution for WP single word prompt:”WITNESS”.