What is the American native flute commonly used by street musicians?

I don’t have enough specific information to identify the exact instrument used by two street musicians in Spalding, Lincolnshire between 2006–2010. However, the common name for the instrument you describe is the Native American flute (also called the American Indian flute or simply the Native flute).

A few brief notes that might help you confirm which flute they used:

• The Native American flute typically has two chambers (a slow air chamber and a sound chamber) separated by a block or “bird” on top.
• It’s usually made of wood, has a sweet, haunting tone, and is played vertically like a recorder.
• Common keys are A, G, F, E, D; many players sell CDs at street stalls.
• Other similar flutes include the Pueblo-style flute and various contemporary handcrafted flutes labeled “Native American style.”

If you can provide a photo, a short audio clip, a description of markings, or the players’ names or stall name, I can try to identify the exact maker or model more precisely.