In addition to being a valuable compositional tool, an aid to communication, and a potential money saver, music theory can also help in solving problems and fixing trouble spots in your song.

Being able to instantly analyze the meter in the first stanza will help you make the next one symmetrical without all the head scratching and vague notions that something doesn't feel right. When chords that should work clash and harmonies don't fit the style of your song, knowing the theory behind these elements will give you solutions to the problems. When the chart is wrong or a part needs to be changed, theory can save you time and money in the studio. Wouldn't you like to be able to explain to a sax player or drummer exactly what you want? Do yourself a huge favor; devote some time to learning how music works. It'll pay off in the long run.