For at least the past 20 years, real lyric heads have known that the Mountain Goats’ John Darnielle and the the Hold Steady’s Craig Finn are two of the best writers — arguably the two best writers — operating in the indie rock sphere. Darnielle and Finn have plenty more in common, too. They’re both nontraditional singers and expert ranters with splenetic, distinctive, wild-eyed stage presences. Like so many great writers, they both have complicated relationships with religion. When you go see either one live, you know that they love what they do. Finn and Darnielle have been friends for a long time, and their two bands played some shows together last year. Last night, both of them got together at Carnegie Hall to celebrate another great rock writer.