Is there a right or wrong way to write a song? Some say yes others say no but ultimately the listener decides what is good.... To them anyway. Songs, poetry, stories and even simply rhyming phrases are all forms that can be used to write songs. And songs need not have lyrics. Instrumentals can sometimes be accused of not being songs of looked at as incomplete, having no lyrics. But needless to say, they are just as much a song as anything else. So don't feel you need to be able to write lyrics to write a song.