The genre varies. I own almost every fiddle video that Homespun Tapes has produced, as well as others including Mel Bay, Ridge Runner, Texas Music And Video, but have not seen a lesson devoted exclusively to fiddle backup playing. I've learned some from the VHS tapes such as Jay Ungar's 'Ashokan Farewell' where long violinistic chords are drawn out and held during the guitar instrumental. I can do that fairly well and understand basic chord playing on the fiddle. What I really want to learn is the "cat and mouse" interaction between the vocalist and the fiddler. Playing like Country and Western backups to honky-tonk songs including Ray Price's 'Crazy Arms' (Tommy Jackson's backup) and 'Frauenlien' (which also has some nice fiddle chord chops) by Bobbby Helms whose fiddler was Paul Warren. Other examples are the John Prine tune 'Paradise' where Stuart Duncan plays backup,and fiddlers like Dale Potter, Benny Martin, Buddy Spicher (violin backup to Linda Rhondstat's 'Long Long Time'). And finally, most of all, the backup playing of the great Hugh Farr of "The Sons Of The Pioneers" So, as you can see, just about any style of backup.