I totally agree with Adam Szuster’s reply #15328.
As has been covered music is a personal thing. Some like it to rev themselves up, others use it to calm their nerves. Others like to absorb the atmosphere and use that to bring out their best.
In the case of Wimbledon, a large part of the aura of the tournament is the tradition. If the organisers are concerned that listening to music on the course is ‘disrespectful’ then they need to write the rules accordingly. If there is no rule then the athletes are allowed to do what helps them the most and if that is to listen to music then so be it.
Personally my reaction to the comment is ‘To whom is it being disrespectful to?’. Other players? The crowd? The Queen? – May be? As for me, entering the arena and bowing to the queen 1st is an act of respect.