Writing popular music is a great way in which a song writer can express their feelings in a beautiful way or a fun way. Anyone who dreams of writing music or does write music already wants their song to catch on and become well known by other people. A writer needs to consider a title for the song that should describe the song itself, it needs good lyrics that rhyme and tells the entire story. Your song will need a beginning, a middle and an end, just like a story. But what is really important is that your song have a good chorus or “hook” as it's called in the industry. This is something that should make your song memorable because this is usually what most people remember first about most songs, is the chorus.
Your hook or chorus will need to depict what the song is all about. Sometimes it will even duplicate the tile in it. For example the song “I Can't Help Falling in Love With You” by Elvis was the title but also part of the chorus and was a huge hit for Elvis.
Your melody for your chorus should be able to blend in with the rest of your song so it doesn't sound like it's a song on it's own. However, there still need to be enough of a change in the chorus from the main part of the song so that people know it's the chorus and not the regular part of the song. Usually more upbeat or notes that are brighter are used in this part of the song for more emphasis, especially if it's a happy and up beat song to begin with.
You need to make sure that the beats of your chorus are consistent with the beats of the lyrics just before it. For instance, if you are coming out of a 10 beat last lyric line then you don't want your chorus to come in with anything much longer or shorter than those 10 beats. Even though you want to attract attention to the chorus you still want the song to flow.
Your chorus will need to rhyme but make sense at the same time. Remember words tell the whole story and it should be done in just a few words in your chorus. You can run two sentences directly after each other like “I thought I had a lover and a friend, Till I found out all you did was pretend.” This hook is telling a very quick story that also rhymes and both parts have 10 beats each.
Your chorus or hook should also be very easy to sing with and the ideal chorus is usually in a middle key so just about anyone can sing it and still be close to being on key when they do sing it. It also should be something that people would not be ashamed to sing along with out loud. When writing a song, remember you really want to appeal to the majority of people and not just a select few. So your hook or chorus needs to be as universal as you can get it. It also needs to try and reach both men and women unless as the writer you are trying to target a specific audience then that would change things a bit when writing your chorus.