fanny pack vs kit violin

fanny pack

noun
  • A small fabric pouch secured with a zipper and worn at the waist by a strap around the hips. 

kit violin

noun
  • A very small long-necked violin that came in a variety of shapes and configurations, meant to be carried in a pocket and intended for dancing instructors to carry to accompany their students. 

How often have the words fanny pack and kit violin occurred in a corpus of books? (source: Google Ngram Viewer )