When you get into the car, the first thing you do is turn on the radio, to listen to some music and make driving a little more joyful and fun.

Actually this habit should be eliminated, because it is a bad behavior that can be also challenged by law enforcement.
When driving around by car, it takes for granted that everything is going for the best, always. But this is not the case, anything can happen and for this we must always be vigilant and attentive, at any time.
What does the highway code say about the radio on in the car while on the road
If today we can circulate in tranquility or almost, it is only because the movements are regulated by the highway code so hated by all motorists and motorcyclists. If everyone behaved in their own way, there would probably be no guarantees or security of any kind. These rules only work because the highway code is constantly updated. This is why we should stay up to date, so as not to make mistakes unknowingly.
But returning to the habit of turning on the radio, it is wrong to do so because it distracts both if set at high volume and low.. In fact, in any case it distracts attention from what is really important or the presence of other cars, motorcycles and pedestrians. Among other things, it is difficult to hear any noises, roars, screams and so on, which makes driving even more dangerous.

How high the sound threshold must be and what is the risk if it is exceeded
The threshold not to be exceeded is established by the highway code, paragraph 1 says that the sound level must not exceed 60 db at 10 cm from the driver’s ear. But exactly what is 10 decibels? Perception varies according to the distance from the person to the source, then to the speaker. Things get complicated since modern cars have more than 4, while old cars only have 2. If you take the example of a car that has 8000 watt external amplifiers, however much the window may be closed the music you hear it from the outside.
If it is also associated with this the fact that you sing out loud, there is already talk of pure violation of the Highway Code. So in this case the police can proceed with the fine. You may be fined even if you are wearing headphones or earphones. In the case of earphones, you can only wear one and not both. In general, the fine ranges from € 41 to € 168, if you then disturb the public peace with noises and noises, you also risk being punished with arrest for up to three months plus a fine of € 309.