When he first discusses what motivated him to book the San Francisco Gay Men’s Chorus on a tour of five southern states in 2017, Tim Seelig, the group’s creative director, mentions the 2016 election and the widening cultural divide in America. The attitude was not “we’re here, we’re queer, get used to it”; the chorus is a genteel organization that uses music to heal and build bridges. But Seelig is clear about his desire to actively confront states that have enacted strong anti-LGBTQ measures with a strong message of love and tolerance…