I spent this past evening at a very pleasant filk singing event held by the GaFiA organization. That's Georgia Filkers Anonymous. Filk singing is a tradition that grew out of the singalongs held during science fiction conventions (as I understand it, anyway). I was told at this gathering that a definition of filk music is anything that is song by filkers (or something like that). In other words, it can be just about any music that the participants want to sing. This group had many talented musicians and it was a thoroughly enjoyable evening.