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Now that you have a good idea of the sound your completed song will have, arrange your rhyme into verses (16 bars apiece). You can start each verse with nearly any rhyme, but it's a good practice to end with a rhyme that makes a point. This way your verse doesn't seem to be left hanging. A popular song structure would be:  Intro Verse Chorus Verse Chorus Verse Middle 8 (a.k.a. breakdown) Chorus Outro Practice rapping your song on your chosen beat to work out the bugs and optimize your written verses. Cut out as many words as possible and then cut out some more. Remember, a rap song is not an English paper; only use the words that are needed to make your point, nothing more. Don't be afraid to add a pause or two, which can help to enhance a certain point in the song. Rap your lyrics over your beat until you have memorized every breath and you are sick of hearing them. Only then will you be ready to produce your song. Either hook up with a producer to get the recordings and mastering completed or self-produce the song. Put it on SoundCloud. Create a SoundCloud account. Edit your profile, then upload your track. Remember to use hash tags. Be online every day to get people's attention and reply to every question you get from anyone.
Structure the song. Rap and refine. Memorize your song. Produce the song.