Monday nights at 10 p.m., Park Circle neighborhood bar The Mill hosts North Charleston’s most engrossing and unpredictable cavalcade of musical incongruity. On any given open-mic night, you’re liable to hear fun-loving hip-hop with a live band, provocative singer-songwriter balladeering, singing-saw love songs, punks playing acoustic renditions of Alkaline Trio, and impromptu jazz combos that formed over drinks at the bar. There’s never a cover charge, so splurge on some craft beers, grab a booth seat with some friends, and just try to process it all.