Much harder question to answer. If the aggression comes from external stimuli, learning to mitigate it is just part of growing up (and, I don't mean reaching the age of majority; I mean growing as a person... there are people in their 50s and 60s trying to figure some things out — that's why older folks say youth is wasted on the young, because after figuring a lot of these things out, they haven't got that much time and certainly aren't in their teens or 20s). Like for example if it's road rage — people making you mad on the road — leave earlier, first of all, as that reduces the stress of reaching your destination on time; second, try listening to more soothing music. This is subjective — if metal calms you down, by all means, horns up. In fact, it isn't even metal music I'm thinking of driving aggression behind the wheel — it's political news and political podcasts. Especially the ones telling us who to fear or who to hate. For most of us, the most harm we will do is actually to ourselves and our loved ones rather than the people our political masters tell us to hurt or hate. Focus on something else. If you prefer talking to music, audiobooks are awesome. While the bestsellers tend to feature a lot of tense situations (drama), there are some that are lighter. For me, I go for Japanese light novels (equivalent to young adult fiction). So, like adventures and stuff. The ones made into audiobooks have also been made into anime, and they usually get the actual anime voice actors to read you the book, so, it's like anime in audio/spoken format. If that's not your jam, well, there are loads of other options. As for music, I can point to a handful of songs I just cannot get mad if I'm hearing, but they wouldn't work for others.