Guillaume Apollinaire
Two years after being wounded in World War I, Apollinaire died in the Spanish flu pandemic of 1918; he was 38.
Louis-Gabriel Guillemain
Guillemain eventually moved back to Paris, where, in 1737, he became a "musicien ordinaire" to the King. His career was progressing rapidly, and by the early 1740s the composer was among the highest-paid musicians at the court, regularly performing in private concerts before the royal couple. He continued publishing his music, and his works were frequently performed at the court in the late 1740s and early 1750s. Fellow composer Louis-Claude Daquin praised Guillemain in his 1752 "Lettre sur les hommes célèbres":
When one speaks of a man full of fire, genius and life, one has to think of Monsieur Guillemain, Musician to the King; he is perhaps the most extraordinary and adroit violinist one can hear play. There are no difficulties that can stump him and he can compose learned pieces which sometimes embarrass his rivals. Among the great Masters, this celebrated artist is one of the most productive. His works are full of touching beauty.
However, Guillemain's private life was troubled. He was apparently a heavy drinker, especially in his later years, and he was also continually in debt because of his affinity for making expensive purchases. He died in Chaville, then a small settlement near Paris, in 1770; some contemporary accounts describe his death as a bloody suicide, with the composer stabbing himself with a knife fourteen times. However, the drinking habit and the fact that Guillemain was buried, may indicate that he died a natural death.