Primarily melodically, even with songs.

For me, much is about participation and I prefer the informal although I do not believe every event should cater for everything that might be considered folk and I will seek out quite specific events (eg. Irish tunes with few or no songs). I'm not much of a one for concerts.

Dance is a bit of an odd one for me as most of my enjoyment comes from dance music but I don't really get much out of a display of morris dancing or Irish dancing, etc. An exception to this is something like a barn dance or ceilidh. I don't dance myself but I can enjoy watching others have a good time with this while listening to the music - maybe there is a bit of the "performance art" vs "participation" there? - I'm not sure.