Some of them whistle, some dance, some play flutes and many of them are tricksters and pranksters. Sometimes the Turtle/Tortoise make their own flute and other times they steal it from someone else. In a North American story, Vulture gets quite upset over having his flute stolen in one story and carries the hard-backed thief into the sky and drops him, thus explaining the "broken" patterns on Turtle's shell. They play a wide range of flutes
too: ocarinas, rim-blown flutes (like quenas), pan-pipes and quill-pipes
to name the ones I've run across. (The Andes in South America have a wide range of
different styles of flutes.) I think I like the South American story of the Tortoise wanting to sing like all the birds in the world, and inventing flutes to do so, the best.
I have run into Turtles linked to music in stories from Europe too but no where near as frequently and those Turtles aren’t cast as musicians themselves as often either (The Greek
invention of the lyre was inspired by a Turtle though the poor guy gets killed in the process). The American Turtles/Tortoises make music themselves and have a good deal more fun even when they get in over their heads. The slow,
thoughtful trickster figure (instead of the rapid fire ones more commonly mentioned) has been lots of fun to read about even without the musical enticement (which of course I love too.)
I have gotten quite fond of the idea of a Great Musical Turtle traveling
across the land causing trouble, making people laugh and dance. And I admit to identifying with those flute playing Turtles when I’m going to a show and carrying every instrument I own on my back.