I just returned home after a long day of work. The sky is clear, there is full moon and it is -18°C. I'm about to go for a short walk with the horses. I try to write a proper reply after that. For now only this short note:

Yup, Finnish grammar is not easy for a machine translator =) I bet it becomes easier if I tell you where to split the words. First, try separately "huuliharppu" and "kostaja". And further, you can split the first part to its basic components "huuli" and "harppu" =)