I haven't got my hope up this time 'cos this is an obscure one, but, can anyone help?.

The current advert for this power giant is playing a harmonica tune that I know I had once many years ago when harmonicas were popular (Larry Adler etc) although I don't think this was one of his.

It sounds as though it is supposed to be a train with the occasional vocal oohs and aahs. My brain keeps flashing words like train and blues but it could be nothing, and it's driving me NUTS!!.

Anybody help pleeeeeeeeeeeese?

whb