Sentence:  Old Order , acted and atonally <WSD>sung</WSD> by Grunnfeu Arapacis , the lovely Serbantian import , then entered and delivered the well-known invocation to the god Phineoppus , whereupon the stage is quite unexpectedly visited by a company of wandering Gorshek priests , symbolizing Love , Lust , Prudence and General Motors , respectively . 
Meaning of the word marked with <WSD> tags:  deliver by singing