Merry Christmas When do people usually say "Merry Christmas!"? On the 24th or on the 25th of December? May I say those phrase to everyone?

Listen to music I like to listen to the music. I like to listen to music. Wich is correct? I know the rule: the nown 'music' is uncountable, that's why I should say "the music". My textbook says so. But I've seen some other sourses in the internet. They say "listen to music" is correct. I'm confused.

"I like to go to the cinema" - is it correct? Or I should say I like to go to movies?

Background noise of the the speakers with integrated amplifier Hello, I’ve become owner of the Integrated Amplifier, and when connecting it with my Dynaudio speakers you can hear constant background noise irrespective of volume and which input is connected. This background noise is comparable with the noise of my previous amplifier Cambridge Audio if I turn the volume up a lot. If the volume was low or zero, there wasn’t any noise at all. Moreover, I can hear a low hum from the low-pitched loudspeaker, and it’s more strongly from the right loudspeaker than from the left. Although, you can’t heat it against the music background. If you turn all the equipment which makes noise off, you can hear that hum from the loudspeakers while you are sitting on the sofa, and the higher is the volume the higher is the hum. Is that situation regular? Can I do anything to eliminate this background noise and hum? Thank you. Regards,

An apology letter Hello Billy, How is it going? Too much time has gone, really. I hope you are well. Do you remember that girl who lived next door, who has always been friendly and cheerful? It’s me. You don’t know about me pretty much. Although, I cannot say for sure that I know myself. Well… What am I talking about? Oh, yes. One day I intended to kill your wife. By the way, you weren’t really down in the dumps after her death as I dare to observe, were you? You are still unpleased by recollection of that unforeseen event though. No sooner she had realized why I was going to kill her than she was about to cry. However, it was too late. I was absolutely devastated and lost my temper. She had been watching TV every time except when she slept. In addition the sound was too loud. I thought she hardly deserved life. Have I dared to judge her? I shouldn’t. I wish I got it at that time. If I hadn’t hit the roof I would have spoken to her. I would have explained to her that she lived a wrong life. If she had considered my words, I would have taught her to enjoy life to the full. I might overestimate her as a matter of fact. Well, I’ll tell you what has happened to her in fact. I was standing motionless in silence with a big chief knife in my left hand. She hadn’t been able to hold my baleful stare so she started to fall down and stand up several times moreover accidentally striking her head against the floor. The floor was really wet for some unknown reason. I came closer to help and she fell down on my hand holding the knife. That’s it. You know, it’s not my fault. In any case I am sorry, Bill. Best, Alice.

What is the best English grammar textbook? What are the best English grammar textbooks for the intermediate, upper-intermediate and advanced level in your opinion?