I read that wine bottle produces sound when u blow sideways onto its rim because some frequencies of the white noise produced in your mouth gets amplified when they match the natural frequency of the bottle. But is the tight neck of the bottle necessary for this to happen? If I blow into a closed end tube with uniform width, can't I produce the same effect? Why do I need the small opening?
This phenomenon is known as flow-induced resonance. We learned about this in the submarine Navy, as water flowing over an open hole in the deck will produce a tone, and making tones is a bad thing for subs. The only links I could find for this were to scientific papers about the effect.
You personally need the small opening because you can't produce enough flow across the bottle if the opening is large. But a large enough flow would work on any size hole/tube/bottle combination, although the resulting resonance may be outside a human's perceivable frequency range (20 Hz to 20 kHz for young healthy individuals).