Future Boeing 777-200LR GE90 Sounds

Absolutely not. You can't mistake the howling of the GE90's. To be more specific - these planes are starting at Dubai Airport, I live about 15 km from there in straight line and there are not too many tall structures between my windows and the airport. Early morning the background noise of the city is no factor and you can hear those engines from very far. In a similar way I used to hear the taxing Antonov-24 prop planes on Sofia airport.

Wow! I never knew that the howling could be heard that far away!