My husband is a whistler too. If we are listening to music while doing something he stridently whistles along like a crazed songbird. Geesh! I understand the strangling urge, but he is happy and helping out so I don't say anything. Last time it happened I lowered the music and he whistled more softly - but if your hubby is whistling without accompanyment (is that a word?) then this won't work for you. Perhaps turning some music ON will divert his attention from his current tune (it's time to play the music! It's time to light the lights!)