With future perfect (F2) you jump to a point in the future, turn round and say some action is finished then. Actually a complicated thing and cumbersome and in most cases you can express the same idea much simpler without using F2. This tense existed in Latin and it was imitated by writers.
In current English usage, muse can refer in general to a person who inspires an artist, writer, or musician.
MUSE urethral suppository, also known as alprostadil, is the only localized treatment for erectile dysfunction presently approved by the Food and Drug Administration for use by patients in the United States. MUSE is named as an abbreviated form of Medicated Urethral System for Erection.