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Lachrimae Antiquae (Old Tears), Arranged for Five Guitars (With Optional String Bass), Book 1 (Guitar Plus, B-342): John Dowland, Charles Postlewate: Amazon.com: Books
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O Come, O Come Emmanuel (optional String Parts) By - Part Sheet Music For Set Of String Parts: (4.4.3.2.2.) - Buy Print Music AG.4008S | Sheet Music Plus
GitHub - RyanFromQA/string-optional: A simple utility mimicking Java's Optional but tailored for Strings
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