Star Trek: 10 Times Music Saved The Day
8. Cellos In Space - Sanctuary And Terra Firma Part 1
Star Trek: Discovery's third season introduced Adira and Gray Tal, the Burn, and a fair amount of Cello music. The overarching mystery of what caused fleets of starships to suddenly explode over a century prior begins to quicken apace here, with the clues resting on strings and keys.
Adira, working closely with Stamets, identifies a tune that had been hummed by a Barzan family on the Tikhov as one their former host, Senna, remembered from childhood. This allows them to transpose the notes to the Cello (a skill inherited from their former host, Gray) and eventually, this is transposed into a distress call.
It is this distress call that leads the Discovery to the Verubian Nebula, to Su'kal, and eventually to the restoration of warp drive in the 32nd Century. It may have been quite the convoluted journey to get there but it was the music that lit the way.