As I said, I can get a 'growl' for a word or two, and at today's gig (job) at a really nice AL/IL venue ( I wish I could afford) I did it a couple of times on different songs... as I was packing up, a fellow came up to me and said I should sing "What a Wonderful World" like Louis Armstrong ...
I didn't have the heart to tell him that isn't going to happen ...