The right music is a tool, not a vibe. Here's a small library — three playlists for three different nervous-system states.
Study — instrumental, 70 BPM-ish
Lo-fi, ambient piano, classical guitar. No lyrics in your language. Keep one playlist and replay it — Pavlov your focus.
Reset — slow, warm, familiar
Songs you already love, slowed-down covers, soft folk. The point is comfort, not discovery. Save discovery for the bus.
Hard nights — sad but tender
Phoebe Bridgers, Sufjan, Mitski, Bon Iver. Not for wallowing — for letting something out that's already there. Then sleep.
Match volume to intention
Study volume is low. Reset volume is medium. Hard-night volume is whatever feels true. Volume is half the medicine.