For the past three weekends, Katie Reider wrangled her friends and headed to Seattle’s Best Karaoke in Denny Triangle to say goodbye. Reider received an email from management in March saying the all-ages, no-frills karaoke spot on Minor Avenue would shut its doors for good at the end of April. The business’ month-to-month lease was terminated last month by its landlord.  In a room with glowing disco lights, Reider’s group put their mics down, stood in a semicircle and sang their hearts out to “Piano Man” by Billy Joel, their favorite song to play at the end of a night of karaoke.  Indeed, it was a pretty good crowd for a Saturday . “Just going there, it feels like a tradition,” said Reider, who first visited Seattle’s Best Karaoke in 2021.…