Creating the lyre
The lyre can be made by using an axe to cut a branch from the swaying tree east of Rellekka, and then using a knife on the branch to obtain an unstrung lyre, then attaching golden wool. Doing so requires 25 Fletching.
The Fremmenik Trials
During The Fremennik Trials, you have to go to the stage in the main hall and play the lyre. Wearing a skillcape or being in a guild, champions', heroes' or legends' guild will make the song lyrics different.
After you've played on the stage, you get to keep the lyre.
Players may also kill Lanzig for a Lyre. He can be found in the south-eastern corner in Rellekka.