musical boundaries do exist, jazz is defined by improvisation, that is a pretty elastic boundary, but it does not include this
http://www.youtube.com/watch?v=V_PoPY-mDpA
likewise this is folk music.http://www.youtube.com/user/dickmilesmusic#p/u/12/YytajAIlJ2w as is thishttp://www.youtube.com/watch?v=v-GN-BP_Qlk