by the late 1730s, however, people’s tastes started to change and opera was not so popular. handel changed to writing oratorios. although it is thought that handel invented the oratorio he in fact did not.oratorio is italian, after the oratory of saint philip neri at rome, where famous musical services were held in the 16th century. handel is just one composer of many who wrote oratorios. his oratorios are based on the english tradition of the masque, which was something between a play and an opera. however, oratorios were about stories from the old testament. instead of ancient gods or roman emperors (which is what operas were about at that time) he used dramatic stories from the bible. among many great oratorios that he wrote, "messiah" is his most famous one. however, it is different from his other oratorios in some ways.