Serious and heavy pure music Beethoven's Moonlight Sonata is quite serious, dear, but it doesn't seem to be in line with drug control after listening to it.

Bandari's A New Morning has a steady melody. Some parents can listen to this. It should be possible to use it for drug control.

Bandari's Snow Dream is a piano-based piece, so you should have heard it.

Bandari's Endless Horizon, I think this piece may be more suitable for making the most anti-drug background music, but it has a feeling of hope.

The above is my suggestion, which is ultimately decided by my parents. I just provide some tracks. If I can't find the right one, I can keep asking, and I will also find more tracks for my parents.