I have to agree with Colin & Alison! I have a 15 year old daughter who has worn the video of Titanic out! (Shall I start a I hate Leo D thread?) It drives me mad as i've ONLY seen it 5 times BUT I get to hear it a lot more. It SOUNDS like a LOW D to me but with all the sound tweaking going on it could be any lowish whistle key - but it sounds like a LOW D to me. When Celine Dion sings live the whistle player IS playing a conventional whistle - not sure which c ish? The only sure way is to look at the letter stamped on the top! Bev Lawton