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is it an specific music player?
That's quite odd, what if you clear Chrome's cache?
Does this happen all the time? because if it doesn't then its the website that might have a popup or some music or video playing
I am having the same problem too. I figured out that it happens when a page you are viewing displays too much pictures or stuff other than PLAIN TEXTs.
This really should not be happening to a phone having ~1GB RAM. It seems that multitasking is quite heavy for the phone.