If you find yourself wandering South Congress and hear laughter, toasted shots and unguarded renditions of “Sweet Caroline,” you might be near Ego’s, a dive bar and karaoke institution that has welcomed locals, visitors and even Texas politicians to the mic since 1979. Tucked under a building behind a gas station, Ego’s feels like an old secret that every Austinite wants to share and one that newcomers delight in discovering. The low lighting, affordable drinks and nonstop karaoke make Ego’s the place to let loose, celebrate birthdays or just belt out tunes beside a crowd that knows the words by heart. For years Ego’s stood as one of South Congress Avenue’s most recognizable nightlife hangouts, known for relaxed drinking and the high-energy atmosphere that only a good karaoke night can deliver. You could walk in as a stranger and leave with a story about the time you sang Journey at 2 a.m. or felt part of a group cheering someone’s first time on stage.…