Regarding live entertainment, was just at the St. James Power Station, adjacent to the "new" (for me, and possibly others ) Vivo Mall, and there are quite a few places with live entertainment there.

I only went into The Boiler Room as a guest of a member, but it wasn't too happening as far as the crowd was concerned - no young vibrant types and not many foreigners at all....

However, the live performance was pretty good, (acceptable)

Just found their website: http://www.stjamespowerstation.com

(Edited to add: I think that Powerhouse at the St. James is the place for dance, according to local blogs...)

Live entertainment is difficult to find, and what Savage25 posted is what is considered to be the "standard" for Singapore.