One of the most unique social systems in The Lord of the Rings OnlineTM: Shadows of Angmar™ (LOTRO) is the player-generated Music System, which allows players to train specific instruments and play their own music!
First, you'll need to purchase a music skill from your Class Trainer for a specific musical instrument.
Next, you'll need to obtain an instrument on which to play. You can purchase an instrument from a Bard NPC or an Auction Hall, or obtain one from a friend skilled in the Woodworking profession.
All you need to do now is type /music and you are ready to make your own tunes.
The keys used to play the notes on your brand new instrument are:
We at LotroLife.com plan on introducing a player application for testing your LOTRO musical skills before you go into the LOTRO world and impress the crowds. Until this feature is deployed you can check out some of the resources we came across concerning the music system.
The official European LOTRO Music System Forum: http://community.codemasters.com/forum/forumdisplay.php?f=691
EU Forum topic with a compilation of various tunes - over 20 pages long: http://community.codemasters.com/forum/showthread.php?t=161657
An excellent page that came to existence from the above topic: http://lotro.glenneroo.org/music.html
Here's a collection of videos some of the players made displaying the possibilities of the LOTRO music system as well as their own music playing capabilities