1. This is the book I used.

  2. This is a book I used.

  3. This is the music I listened to.

  4. This is a music I listened to.

1 and 2 are implying that the book and the music were mentioned before at least once, so the listener already knows some part of the stories.

Whereas, 2 is implying that the listener is hearing about them having studied that book for the first time.

I want to make 4 the same as 2, but I can't use determiner 'a' in front of non-countable noun. What should I do? What am I missing?


"Some music" or "a piece of music".

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