Archived request from the wiki:

Viola da spalla

• Other names: Baroque violoncello
• Other links: http://violadaspalla.com/
• Family: Strings/Bowed string instruments
• Description: a Baroque string instrument sized and tuned between the viola and the cello
• Appears on:
  1. Menina Played by Antonela Pareschi on tracks 3 and 8, credited as violone