Subject: About your noisy neighbours
Hey [Friend's Name],
I'm so sorry to hear about the trouble you're having with your neighbours. It must be really frustrating not being able to study because of the loud music.
Why don't you try talking to them first? Maybe they don't realise how loud they're being. If that doesn't work, you could try speaking to your landlord or the building management. They might be able to help mediate or enforce noise regulations. This way, you'll hopefully be able to find a solution without things escalating.
I really hope you can sort this out soon and get back to studying in peace!
Best,
[Your Name]