Hilariously the view from the UK side of the pond is that all our young people now have these terrible manufactured US accents...
But my mates would sometimes launch into a very broad scouse accent to tease me; I could only just understand that.
Things have changed. Nobody nowadays speaks Geordie with the very broad accent that I couldn't understand as a kid.
The only way you don't is if you purposely slow down your singing make it sound like your talking accent. This works with some genres (e.g. rap) but not others.