Hum - "dinger" or "drum" starter Hum - "downward is heavenward" band Hum - "rattle and __": u2 album Hum - 'by the sound of it, an addition could make it like us (3)' Hum - Accompany musically, maybe Hum - Air-conditioning sound Hum - Almost sing Hum - Amp problem Hum - Annoying speaker problem Hum - Be at a loss for words? Hum - Be busily active Hum - Be busy Hum - Be busy, as a bee Hum - Be in great activity Hum - Beehive sound Hum - Bustle Hum - Buzz Hum - Carry a tune without words Hum - Continuous sound Hum - Copier sound Hum - Drone Hum - Drone - stink Hum - Droning sound Hum - Drum head? Hum - Electronic noise Hum - Engine noise Hum - Engine room noise Hum - Engine sound Hum - Expression of hesitation - one of pooh's? Hum - Fail to know the words, maybe Hum - Fake the vocals in rock band, say Hum - Fan noise Hum - Forget the lyrics, maybe Hum - Fridge sound Hum - Good engine sound Hum - Good noise from an engine Hum - Had smash "stars" Hum - Half-cut people murmur Hum - Hive sound Hum - How to play the kazoo Hum - If, though sound, it bled, that would have cut it down to size Hum - Indistinct murmur Hum - Insect sound of doubt Hum - Low continuous sound Hum - Low murmur Hum - Low sound of bad smell? Hum - Low, continuous sound Hum - Low, droning sound Hum - Machine sound Hum - Make music on a comb Hum - Make music through closed lips Hum - Make music, in a way Hum - Make musical sound with closed lips Hum - Marque le doute Hum - Motor noise Hum - Motor sound Hum - Murmur Hum - Often upset, ignoring constant mechanical noise Hum - Participate without the lyrics Hum - Play a kazoo Hum - Play the kazoo Hum - Pong Hum - Reek Hum - Refrigerator noise Hum - Refrigerator sound Hum - Render a tune Hum - Rhythmic sound Hum - Run nicely Hum - Run smoothly Hum - Run smoothly, as an engine Hum - Run well Hum - Sign of smooth operation Hum - Sing like a bee? Hum - Sing with closed lips Hum - Sing with closed mouth Hum - Sing with lips closed Hum - Sing with one's mouth shut Hum - Sing without words Hum - Sing wordlessly Hum - Sing, in a way Hum - Smell badly (slang) Hum - Smooth engine sound Hum - Sound (of business?) Hum - Sound happy, maybe Hum - Sound of a bee Hum - Sound of a fan Hum - Sound of a well-tuned engine Hum - Sound of busy activity Hum - Sound of tires on the highway Hum - Sound system problem Hum - Stench Hum - Substitute for forgotten words Hum - Symptom for a car mechanic Hum - Theme, part 2 Hum - This could have bled in a base sort of way Hum - U2 album "rattle and ___" Hum - U2 album 'rattle and ___' Hum - Unpleasant smell Hum - Use kazoos Hum - What fans do Hum - What you can do if you don't know the words Hum - White noise, perhaps Hum - Work smoothly