Someone is playing or more like messing around with some type of wind instrument.
A musical instrument with a sliding tuner that is pulled in and out while air is being blown through it. A person blows through a cylinder with short burst with long slides for high pitched whistle. A person blows through a cylinder, with short bursts, and with long slides for a high pitched whistle. Someone is playing or more like messing around with some type of wind instrument. Someone messing around with some type of wind instrument.