I plan to use Uncle Bernard as the basis for a workshop about simple ideas to add variety to a piece of band music ( real basic stuff like play loud/soft / octave higher/ arpeggio to accompany). In fact its a d7 so from what I've gathered a c natural would be best. I tend to play melody instruments so I can sugggest lots of twidly bits to do with the melody, but my harmony knowledge is minimal so I thought just doing it a third above would be one of the simplest ideas. FloraG