Singing candles:

A fascinating mix of microelectronics, sensors, and marketing!

But singing candles are for real; there's even a "play list"!

They even have a patent on the technology: US Patent number 05015175, MELODIC CANDLE ASSEMBLY

And there's still an interesting story behind this.....

Even "serious people" study candles... see this link to NASA for a zero-g candle flame study. I think this is officially "Candle Flames In Microgravity * USML-1 Glovebox Experiment #8". Neat pictures and interesting physics can be found there!

Take a look at Shuttle Mission STS-50:

And combustion in space continues on STS-75!

And there are other interesting stories related to combustion, such as flaming toaster-based pastries.