1) Have a way to mark music by 'club' used at.
2) Have a way to mark used by other callers so that if several
callers are together it's easy to filter on the singing calls
that the N callers have in common.
Add field 'Last Dance used at'.
On multiple imports, add checkbox 'BS is always this label'.
Add 'Remove all Duplicates'.
Warning if adding a duplicate. Continue (Y/N)?