1) Ambient sounds 2) Bombinates 3) Bustles 4) Buzzes along 5) Close-mouthed singing 6) Drones 7) Droning sounds 8) Forgets the words 9) Hi-fi annoyances 10) Insect noises 11) Is abuzz 12) Is at a loss for words 13) Is busy 14) Joins in wordlessly 15) Makes a drone 16) Many early Zola readers 17) Motor noises 1) Croons