I looked into this, and music plays fine on my machine, so I had a look at the settings, and what happens if you change them.
Apparently, moving the slider all the way to the right will make the interval between music tracks bigger. That means you'll have to wait longer for the music to repeat.
Setting it all the way to the right might even disable it (not sure, but you mentioned it took an hour and still did not hear music)

After you've set it to the max once, the game will not reset from this state. You will need to change the slider to a lower value, and then reboot the client in order to make the music work again. Or you can also travel once and it will be resolved as well. It kinda looks like it will pick a delay time right after the music ends, and will stick to that time, no matter if you change the settings at that point.

Moving the slider all the way to the left repeated the hawksmouth music for me every 5 minutes. Let me know if this fixes your issue.