A collection of musical scores and recordings could be split up because of a delay in plans to build a library.
People fighting for a new book and music library in Lewes warned the collection might have to be divided if a new home was not found.
The £2 million library project has been under threat since the summer, when East Sussex County Council announced budget cuts.
The music library has to leave its home in St Anne's Crescent in April.
Without the new library as a home, campaigners fear there will be nowhere for the collection to go.
It had been scheduled to be divided temporarily between the existing book library in Albion Street and a council book store before going to the proposed new building, behind Lewes House.
Alan Brothers, of the Lewes Library Friends, said everything would have to be moved to another store if the project was cancelled or be split up.
He said: "It is very important not to split the collection.
"It is essential, in our view, to have the books and music together."
Campaigners said it would cost £600,000 to modernise the Albion Street buildings if the new library was not built.
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