Swing, brother, swing.

This is the title of a Ngaio Marsh detective mystery. It is about a swing band and the accordian player is stabbed and so on and so forth. I am a big mystery reader and I do have a soft spot for the Inspector Alleyn mysteries. However, that is not the reason for the title - which is more to do with mood swings. It hasn't quite been metronomic, but there…