Angelina Baker (the fiddle tune) was one of the first old-time tunes I learned on autoharp back when I could still play. It might be done by bluegrass bands also, but in my book it is first and foremost an old time dance tune. I'm an ignorant git about origins of music. I was shocked to learn only a few years ago that Stephen Foster wrote a song by the same name, and had to listen hard to Stephen Foster "versions" before I was convinced the fiddle tune (and the few lyrics I associated with it) were related to the Stephen Foster tune.

YOutube really doesn't have a good selection of old-time Appalachian string music. Bluegrass dominates, and the technology wasn't there before many of the old-time fiddlers in my neck of the woods at the time (West Virginia) had died.

Here is one pretty decent Old Time fiddle rendering of the tune from YouTube.

http://www.youtube.com/watch?v=7TDk1ePxgNs

Definitely not bluegrass and definitely not irish.