Why is this artificial intelligence (AI) stock finally a buy again after a long pause? The Nasdaq sell-off is creating a golden opportunity for smart investors.Some short-term market pain can set you up for long-term gain. That's what's going on with SoundHound AI (SOUN -13.85%) right now.Wall Street is backing away from pricey Nasdaq Composite stocks due to economic uncertainty (the index is down nearly 14% from its all-time high as of this writing), and SoundHound AI's stock is trading down more than 22% ...