I was looking on the Wikipedia page for whistling because I was wondering if there was anyone who whistled “seriously” as music. I have heard it done occasionally, by the Avett Brothers (I think) and probably some others, but it seemed to have a sense of informality to it. On the other hand, Alice J Shaw, the famous whistler around the late 19th/early 20th centuries, whistles in an orchestral setting:
Others too—I am tired of staring at this screen though!