Bizarre - my kids playlists, from when they were very young are the opposite - all Metallica, ACDC, System of a Down, Blink182 - you get the picture.

I reckon the noise drowns out interruptions so they sleep well

They also go to sleep fastest if I drive fast round roundabouts - and no, it isn't concussion!
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock