videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including BBC - Merlin Unreleased Music - The Labyrinth of Gedref, Doctor Who Music - "Mawdryn Undead" - Part One, Sarah Jane Adventures Music - The Last Sontaran (p1 and 2)