Yes. e is the colloquial, contracted form of este (3rd person singular of a fi “to be”). So both are correct:
• Muzica este bună. (formal)
• Muzica e bună. (casual)
Very informal speech may use Muzica-i bună, where -i is an even shorter clitic.
You can invert word order or simply raise your intonation:
• Este muzica bună?
• Muzica este bună?
Both mean “Is the music good?”
Phonetically:
mu-ˈzi-tsa | ˈes-te | ˈbu-nə
• u as in “put”
• zi = [zi]
• final ă = [ə], a neutral “uh” sound
• English uses preposed articles: a book / the book.
• Romanian has a preposed indefinite article (un băiat, o carte) but a postposed definite article: băiatul, cartea.
In our example, muzică (music) + -a → muzica (the music).