I’ve explained this before.
I have friendly creatures turned up because that’s the sound that players make. This is extremely useful for knowing if someone is nearby. If you’re outside you can prepare to be attacked, if you’re inside you can prepare to be leeched, or bothered in some other way.
The howl noise was never intended to play right next to the player either. I don’t think it plays at all in vanilla minecraft, although I could be wrong.
This is just a vanity login noise, and there’s no way to get rid of it without disrupting gameplay.