Always try to follow the standards.
Always surround lyrics with <lyrics> and </lyrics> tags; line breaks will be preserved exactly as you enter them.
<lyrics>Love me two times, baby Love me twice today Love me two times, girl</lyrics>
will be rendered as
Love me two times, baby Love me twice today Love me two times, girl
Outside the lyrics tags, when a line break is needed, use a double line break or the <br/> tag.