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 Relaxing Music & Ocean Waves, "Reflections" from Sounds of Kauai, Soothing Relaxation Music - Message from the sea - Sounds of Kauai, Soothing, Relaxing Music - Whispering Sea - Sounds of Kauai