Hi Ian. A refrain is a line or groups of lines that you'd like to repeat more than once in your song, usually summarizing the point of your story. I hope this helps. "A Chorus is the part of your song where all of your instruments, singers or musical elements come together to play and/or sing in unison."
Is refrain and pre chorus the same?
Typically a chorus or refrain will contain the song's primary message while the verses capitalize on this idea by adding specific details to create a story. A pre-chorus creates a bridge between the verse and chorus and allows the opportunity to add depth to your story or message.
What's a refrain in music?
1 : a regularly recurring phrase or verse especially at the end of each stanza or division of a poem or song : chorus also : the musical setting of a refrain. 2 : a comment or statement that is often repeated.