There was a discussion on e-ceilidh recently about young callers getting a foothold and thread drift moved it on to good and bad calling so someone "turned the light on" and said "What about a page of tips for beginners (and knowitalls too)"

I have put the calling tips collected so far on my site temporarilly until a proper home can be found but.....

What tips would you suggest make for good dance calling (or tips to avoid bad calling?)