Questions & Answers about Musikk er lidenskapen hennes.
Because musikk is usually an uncountable noun when you mean music in general, just like in English.
- Musikk er viktig. = Music is important.
- Jeg liker musikk. = I like music.
You would not normally say en musikk for the general idea of music.
Musikk means music in a general sense.
Musikken means the music, so it usually refers to:
- specific music already mentioned
- the music that is playing
- a particular type or piece of music in context
So:
- Musikk er lidenskapen hennes. = music in general is her passion
- Musikken er lidenskapen hennes. = the music / this music is her passion
In your sentence, musikk is the natural choice because it talks about music as a whole.
Er is the present tense of å være (to be).
This sentence is an equational / identifying sentence:
- Musikk = subject
- er = is
- lidenskapen hennes = her passion
So the structure is very similar to English:
- Music is her passion.