Using Distortion Musically in a Mix begins with a clear listening goal. Distortion is most useful when it solves a musical problem: adding edge to a lead, helping bass translate on small speakers, or making a drum bus feel more urgent. More is rarely the answer.
In practical terms, this means making one decision at a time and checking it against the musical purpose of the track. Avoid copying a technique simply because it is common: context, genre, and the listener's attention determine whether it helps.
The most reliable way to develop this skill is to work in small, repeatable experiments. Blend a processed signal against the clean source at equal loudness. Stop when the sound gains identity, then check whether the added harmonics conflict with vocals, cymbals, or other bright elements.
Before calling the work finished, compare it at a comfortable level with a relevant reference. Listen for the intended feeling first, then for balance, clarity, and whether the strongest musical idea is still easy to find.
Keep the result in context with the rest of your track. A good production choice supports the song's rhythm, emotion, and focal idea, then leaves the listener with a reason to come back.