Perhaps you missed The Lumineers or The xx when they stopped by in 2013, and you kicked yourself for it. (You should have.) Maybe you didn’t get tickets for Cat Power when you had the chance. (Dammit.) Who knows, God forbid, you could be the ultimate Belieber who skipped the August show at the arena, then lost your mind when Beebs Twitter-pondered retirement on Christmas Eve. Forget all that. A true blues legend, a veteran of more than 15,000 concerts and a Rock & Roll Hall of Famer can make it all better. At 88 years old, B.B. King plays Downtown and, well, we don’t know how many jaunts down here he’s got left. Regret lasts forever, people. 8 p.m. Jan. 7 at T-U Center’s Jacoby Symphony Hall, Downtown, $45-$75.