Some editions of Music in Theory and Practice, Volume 2 come with a separate workbook. Interestingly, the workbook often has answers for odd-numbered exercises in the back. If you own the workbook, you already have a quasi-answer key. Focus on mastering the odd-numbered questions, then treat the evens as your ungraded challenge.
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: Some instructors or students have uploaded portions of the answer key as PDF documents to Course Hero Some editions of Music in Theory and Practice,