Violinist of Hameln (ハーメルンのバイオリン弾き, Hamerun no Baiorin Hiki?) is an adventure/fantasy story created by Watanabe Michiaki. The story's basic premise is that a group of adventurers are traveling north to The Northern Capital (a.k.a Hameln) to prevent a catastrophe. In this world, music takes on a quality akin to magic and is a strong recurring element in the story.

The manga and the anime are radically different. The manga tends toward a lighter, more comedic tone, whereas the anime is much darker. No official English translations exist for the manga or its adaptations.

Source: Wikipedia