Personally I feel that those topics are more of a tradition based than compared to Religion based.
If we are considering the questions like
- Dress code in Hinduism
- Marriage related questions
etc as on topic, than dance and singing should be considered as on topic as well. These questions should be tagged as traditionmusicdance etc...
There will be two categories here,
- God related questions
- Tradition related questions
God related questions
Over here, questions such as
- Reason behind Shiva Tandava?
Can be asked, which are related completely to god, compared to
Tradition related questions
But again, we can discuss the dance and singing which are related to Gods, for example, Shiva Tandava is nothing but a dance, so question asking like
will be considered as traditional based.
So the bottom line is, if WE ARE CONSIDERING TRADITION QUESTIONS ON TOPIC, than music and dance questions for tradition as well as god related should be considered as ON TOPIC.