For a caller's throat, Kentucky caller Chris Bischoff recommends Singer's
Saving Grace (Google it to find a distributor or retail store). I've not
tried it myself, but Chris raves about it.
Regarding insurance, often dance organizing groups will carry insurance but
I would still recommend callers carry their own liability insurance for gigs
such as parties and weddings.
Jerome
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Jerome Grisanti
660-528-0858
660-528-0714
http://www.jeromegrisanti.com