Rhyming is vital in rap songs, but you don't want to construct a line merely to make it rhyme. Begin by composing your lyrics, and then look for words that are "near rhymes," which means that if you change them slightly, they will form a rhyme. For example, let's say that one of your lines is "We'll be fine-tune this car." You can probably guess what happens if we switch the order of those words: "Car will be fine-tuned We'll be fine-dining." There is no reason for the line to continue repeating, so give your audience a chance to hear the next line by adding punctuation or changing the tone of your voice. Also, remember that not every word has to be a complete sentence. Sometimes, two words are enough to create a nice rhyme scheme. As long as you use proper grammar, you can fit as many rhymes into a line as you want! Finally, avoid using too many polysyllabic words in your lyrics. It can be tempting to use big words when writing about abstract concepts, but these words will only distract readers from your message. Use simple words that represent important ideas. For example, instead of saying "concerto of instruments", try using "a collection of instruments". The same goes for phrases such as "melodic poem" or "sonata form".