I don’t mean singing in a foreign language, I mean if they aren’t enunciating their words.
There is a style of singing where the singer rolls one word into the next word, or just cuts a word off. I find it distracting and I tend to skip the song very quickly when I realize what they are doing.
While it is a popular way to sing, I have never enjoyed it. I heard some of it in the 1980s but it wasn’t widely used. Today I find a lot more singers doing it.
Depends on the type of metal.
Hair metal bands from the 80’s most were easy to understand. Most of AC/DC was easy to understand.
Opera is that rare exception. Not much into it. But once in a while there is something there that I do enjoy