For weghtlifting, sometimes you need background music. It can help judge the space of time between sets, it helps keep the energy in the room--But, could you be listening to music that's hurting your sports performance?
Let me tell you story. Once upon a time, I was training at the Olympic Trianing Center in East Germany. It was located in Frankfurt Am Der Oder, across the river form Slubice, Poland. The first day I trained there, I was surrounded by lifters dressed like urban metalheads- lots of mohawks, boots, chains. When they turned on the radio, I was expecting some sort of heay metal that hearkened back to the days of the Scorpions or even suggested German metal band Rammestein.
They listened to Kelly Clarkson and a terrible dance remix of the Killers.
In other words, the best lifters in the world do not listen to music that creates a negative or aggressive emotional response. This ties back to the ANS. Weightlifting uses the parasympathetic nervous system- a good lift is done on reflexes, not ponderous thinking of the central nervous system. A lifter needs to be able to focus and zone out the background. Lifting with anger and aggression causes the lifter to tighten up. Thinking angry thoughts to hit a big lift can cause the lifter to, well, overthink the lift.
So, next workout, put on some Swedish House Mafia, relax, and let something really heavy fly overhead.