The Maid Behind The Bar is a great tune worth learning - a common Reel, even found in part of the French Canadian tune, "La Ronfleuse Gobeil"! 

From McNeela (Dublin):

Also known as The Green Mountain, Judy’s Reel and various other iterations of a woman behind a bar, you may also hear it referred to as Freastalaí Laistiar den Cúntar (waitress behind the counter). The Maid Behind the Bar is another iconic reel, usually played in the key of D major, that you will no doubt be familiar with if you’ve been following Irish trad music over the years.

It first appeared in print as Judy’s Reel in Ryan’s Mammoth Collection published in Boston in 1883 and then in O’Neill’s, Music of Ireland (1903) as The Green Mountain. Its origins, however, are seemingly a good century before that and by the 1850s The Maid Behind the Bar was a dance tune favourite in the USA no doubt brought over by refugees from An Gorta Mór (the Great Irish Famine). As you can imagine, there are plenty of variations on the tune, particularly in the opening bars. 

More info & sheet music here: https://blog.mcneelamusic.com/.....d-the-bar/

...I believe the rhythm, along with the ornaments, make this tune special.