My neighbours seem to enjoy singing karaoke but it only ever happens after 10pm. I think they come back from the pub and it starts.
Last time I knocked and asked them to keep it down as I had kids going to school the next say and she was very drunk and said she didn't realise it was Thursday.
It's happened every few weeks since but on a weekend. This week it was both last night and tonight and is in full swing now. I appreciate it's a weekend but it's 11pm and not everyone stays up all night!!!