This is totally different from most of my tastes, but my fav song ever is My Woman. Yeah yeah I know I only technically know about it bc that 90s pop song, but Al Bowlly used to be pretty famous actually!! I'd have to think really hard about what my next favorites are. Probably a rock song, idk.
Of all the Japanese songs I've listened to so far - not really that many yet, but probably Night Dancer from imase (it's on YT if you want to check it out)
this is honestly a pretty difficult question. it depends, it really does, on where I am in my life. my current favorite songs change, sometimes between months, but even in between days they might change. i'm not saying some songs can't stick with you either, it's just that sometimes they hit, and other times you just forget about them completely.
right now I am loving 'I'd Rather Sleep' by kero-kero bonito and アラベスク from リリィ・シュシュのすべて
actually, i now have a song that replaces black mamba by aespa in my list of top five favourite songs. it's called dream of girls and it's by universe ticket (pls listen to it it's really good, also look up the english translation of the lyrics after listening to it)