Basic written rule:
Relief club band (i.e you or your band take over a club band's regular gig coz they have something on): from SGD 100 per head.
Events, Dinner & Dances etc (depending on band and genre): from $250 - $500 normal
x 1.5 for xmas eve and x 2.5 to 3 for New Years eve.
Fulltime 6 days a week in club: $2000 (at least) onwards. Clubs nowadays have bands more like 1, 2 or 3 ngts a week rather than 6 ngts. Top bands of course make killer $$$ based on yearly contracts?
These are average rates as and as a general guide but each & every gig organiser, event company, club, band and individual have their own set of rates of course.
IMHO