Referring to 'jungle music' as it was played in the dancehalls was pretty common for a particular generation of musicians. You cane hear Junior Crehan do the same in the recent documentary aired by TG4 recently and I have heard more than a few others use the term as well. It's unpleasant to our ears and grates on our sensibilities. All I can make of it is that it was common usage and they didn't know any better.