Dick - forgot to mention: I have, in a cupboard somewhere, a rather battered copy, from the late 20s, of a guitar tutorial by Eddie Lang (at least, it has his name on the cover). It's a complex and detailed work - not easy to get through - which shows that Lang was very fond of using "inside voicings", i.e. the inner 4 strings of the guitar, to get dense, subtle and quite fast chord changes. I must dig it out and take a look at it again. I wonder if he ever played tenor guitar as a boy...