Irish Music on St. Patricks day is a must.
There are many great Irish songs to choose from. Although you can't learn them all there are some that are favorites.

Costumes are a great idea if you really want to put on a show. You can choose anything from a green hat and tie to a full blown outfit. You can see Leprechaun Joe here in costume for a St. Patty's day concert.

Room decorations are a wonderful addition to set the spirit of the party.

I have to say that this website here offers a great resource for chords and lyrics to many Irish Songs. www.ourwholeworld.com/irish_lyrics_and_chords.html

Some real favorites found in the website mentioned above are:

Black Velvet Band
Cockles and Mussels
Danny Boy
Drunken Sailor
Finnegans Wake
Harrigan
The Holy Ground
I'll Tell My Ma
Michael Finnegan
The M.T.A. Song
My Wild Irish Rose
Seven Old Ladies
The Unicorn Song
Too Ta Loo Ra Loo Ral
When Irish Eyes Are Smiling
The Wild Colonial Boy
The Wild Rover
and many many more...