How To Use Note Theory To Write A Song . We'll explore each while discussing their emotional impacts and how you can use them to serve your song's purposes. Musical phrases consist of 2 parts: Writing Intervals Music Theory Worksheet Answers Writing Worksheets from www.writingworksheets.co Use scales in the key you chose to convey the mood you’re trying to express. In popular music to each of these chords is assigned a roman numeral to explain its role in the. You should know about basic chords, key signatures, and how to read t.