You ride on me every day but barely notice, I'm hot and cold at the very same time, I'm the densest of my clan, And my first three help you enjoy music. What am I?

Common Wrong Answers
“Car”
While people do ride in cars every day, cars are not associated with being hot and cold at the same time or being the densest of their clan.
“Air”
Air is not something you ride on, and while it can feel hot or cold, it is not considered dense compared to Earth.
“Train”
Trains are ridden daily by many, but they do not embody the qualities of being hot and cold at the same time or being the densest of their clan.
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