〖The Complete Idiot's Guide To Music Theory (2005, 2nd Edition) by Michael Miller〗（音乐理论入门指南）

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〖The Complete Idiot's Guide To Music Theory (2005, 2nd Edition) by Michael Miller〗（音乐理论入门指南）
Music Theory Is Useful（乐理的应用）
　　Of course, it isn't just professional musicians who need to know theory. Even if you're just doing it for your own personal enjoyment, a knowledge of theory will help you better appreciate the music you play or sing. Here's a good example: Let's say you're helping out at your daughter's school and someone, knowing that you're a musician, asks you to work up an arrangement of "Mary Had a Little Lamb" for the upcoming school pageant. There are two girls and one boy in the class who sing pretty well, and another boy who knows how to play trumpet. You'll accompany them on guitar. This doesn't sound like a tall order, but it's one that requires a lot of theory to complete. First of all, you need to know how to read and write music-which includes the knowledge of clefs and keys and time signatures. Then you need to know about chords and chord progressions, and how to create harmonies and counterpoint. You also need to know how to arrange music for different voices and instruments, and even how to transpose music from one key to another. (That's because the trumpet reads music in a different key from everybody else.) YOU see the problem. If you don't know your theory, you won't be able to complete this rather simple assignment. It's as simple as that.
　　When you know the theory behind the music, playing and singing gets a lot more interesting. With a little grounding in theory, it's easier to understand why some melodies are more appealing than others, and why certain chord progressions work better with certain melodies. You'll see how harmony works, which will really help if you're singing background or accompanying someone on piano or guitar. You'll even be able to arrange music for your choir or band, or to create your own compositions.
　　And here's the neat part: Music theory isn't hard. Once you learn the basic notes and scales, the rest falls together fairly easily. After all, a chord is just three notes put together. That's all-just three notes. And a song is nothing more than a few chords strung together in a series, along with a melody-which is just a series of notes all in a row. Figuring out what goes where (and which notes sound good together) is what theory is all about.
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〖The Complete Idiot's Guide To Music Theory (2005, 2nd Edition) by Michael Miller〗（音乐理论入门指南）