Soul Music - thaumator

'I want to know what's going on,' said Ridcully, in a low and level voice, 'and if you don't all shut up there will be trouble.'

He reached into the pockets of his robe and, after a few false starts, produced a pocket thaumometer. He held it up. There was always a high level of background magic in the University, but the little needle was on the 'Normal' mark. On average, anyway. It was ticking backwards and forwards across it like a metronome. Ridcully held it up so they could all see.

'What's this?' he said.

'Four-four time?' said the Dean.

'Music ain't magic,' said Ridcully. 'Don't be daft. Music's just twanging and banging and-' He stopped. 'Has anyone got anything they should be telling me?'

***

Soul Music - p92