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"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(
moo
-
see
-
kah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
el museo(
moo
-
seh
-
oh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).