I took German for 8 months at the Defense Language Institute in Monterey, California. Every day, we had to put on a skit that we have memorized the night before. Those skits impressed speech patterns in our memories, so we learned to speak in phrases instead of by building sentences with words and grammatical rules.
The same would apply to phrases learned from songs, with the added advantage that the melody is an aid to memorization - although, as stated above, one can learn phrases from songs that don't fit so well in everyday speech.

A wiggle and a walk
And a giggle and a talk
Makes the world go 'round.

-Joe-