I assumed (perhaps erroneously) that if a couple was going to use AT music and do an AT dance for their wedding, one of the following would be true:
A) They would have some familiarity with AT which is why they are doing it. In this case, you can't assume that they don't know what they are doing (how would a couple who has no previous exposure to AT even know what the songs are to request a particular one?)
or
B) They are going to someone who is familiar with AT that will be teaching them for the wedding dance, which means that hopefully the teacher would be able to pick a song that makes sense for a wedding taking multiple factors into account. If the teacher gives them a song about heartbreak, gambling, or prostitution and the couple doesn't know it, then it's the teacher's "poor choice", not the couple's.