obbligato /o(b)-bli-gäˈtō/ or obligato /o-bli-/ (music)

A musical accompaniment of independent importance, esp that of a single instrument to a vocal piece

That cannot be done without, that must be used in performance

• aerial railways
• aerial ropeway
• aerials
• aerial surveying
• aerie
• aerie light
• aerier
• aeries
• aeriest
• aeriform
• aero
• aero-
• aerobatic
• aerobatics
• aerobe
• aerobes
• aerobic
• aerobically
• aerobics
• aerobiological
• aerobiologically
• aerobiologies
• aerobiologist
• aerobiologists
• aerobiology