Wow talk about a bunch of strings! This instrument is not your typical Celtic harp because:
The Welsh triple harp (telyn deires) is a type of harp using three rows of strings instead of the common single row. The Welsh triple harp today is found mainly among players of traditional Welsh folk music.
The sound is beautiful as any Harp sound can get. It has a deeper quality than most Celtic harps because of its bigger size.
For a harp maker’s site you can find it here
Watch and listen how it is being played here