SG Foundation level/Access 3
pentatonic scale - bar 1
repetition - bar 3
ascending - bar 1
stepwise - bar 5
scotch snap - bar 2
strathspey - the tune is a strathspey
Scottish - the song is in a Scottish style
single line - the song is a single line melody sung by the voice

SG General level/Intermediate 1
mouth music - the song is an example of mouth music

SG Credit level/Intermediate 2
groupings in simple time - bar 6

Here is a score of Orra Bhonna Bhonnagan with some of the concepts added.

Gaelic Song Concepts page