Spectra is a light and water show located at the Event Plaza of the 5-star hotel Marina Bay Sands in Singapore. Everyone can watch this 15-minute spectacular display for free every night. From Sunday until Thursday the schedule is at 8:00PM and 9:00PM, and on Friday and Saturday is at 8:00PM, 9:00PM and 10:00PM.
If you're visiting Singapore, I highly recommend you include this on your itinerary.