Social media research

I am putting together a social media strategy for a classical choir. I need some information about how other similar groups use Twitter.

I am already an advanced user of Twitter and I am not looking for instructions on how to use it. I'm looking for examples of classical musicians, conductors, orchestras, choirs etc who use Twitter well, and a list of the sorts of things they tweet about. It would also be good to know about any well-used hashtags that this choir could also use. This will then inform the strategy I am writing.

Please record your findings in a Word or Powerpoint document, including screenshots and usernames as appropriate.

This is only a couple of hours work in the first instance so the budget is £20.