A pair of the cars were caught in testing at Fiorano, Ferrari's development circuit, in this video from YouTube's Marchettino. Each car seems to sing a chord, merging together into a symphony of V-12 hybrid sound.
It's not the first time we've heard the LaFerrari at full song on track at Fiorano, but it's the best audio and the longest uninterrupted run yet.
A quick recap of the LaFerrari's (still somewhat vague) key specs: 950 (American) horsepower, 0-60 mph in under 3.0 seconds, 0-186 mph in under 15 seconds, and a top speed greater than 217 mph. An even more extreme version of the LaFerrari was briefly rumored, but those rumors were quickly exterminated by Ferrari.
FULL COVERAGE: Motor Authority's Ferrari LaFerrari Zone