vs
QUICK ANSWER
"Música" is a form of "música", a noun which is often translated as "music". "Museos" is a form of "museo", a noun which is often translated as "museum". Learn more about the difference between "música" and "museos" below.
la música()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
el museo()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).