Hello Melonie,
The topic of music is fine. However, having a narrow focus on lyrics might make research difficult because that will require you to pick only one song and to find relevant studies. I would recommend focusing on the broad benefits of music in general.
You should also make sure you have a policy statement (what action do you expect to be taken based on your argument?)
Some policy ideas:
1) individuals taking music classes or learning a new instrument
2) investment in music programs in schools or communities
3) funding music therapy for mental health or Alzheimer's