From the pipe band perspective, the sudden rise in pipe bands in the post WW2 period to a number which exceeds the pipe bands in Scotland. Many of the Ulster-Scots pipe band tunes are played worldwide eg The rowantree.

The spread of the fiddle from Lowland Scotland to ulster (during migration) to America and the tunes associated with it.

And the fife and lambeg drum - tunes and times which have been around for over 2 hundred years now, unfortunatly lots more tunes etc have been lost over time as well.