Read the following context and choose the best option to answer the question.
Context: As the weeks turned into a couple of months , God began to give me phrases and words that I would pen on paper from time to time . As this continued , God gave me a tune in my heart for those words and ultimately He wrote a song through me to her . I sang the song to her at her baby dedication service . A friend of mine from high school that owns a recording studio in Nashville , put it down on a track and it turned out so beautiful ... .
Question: What does the subject do for a living ?
Options: 
- They produce music for a living .
 - They write poetry for a living .
 - They write textbooks for a living .
 - They write music for a living .


They write music for a living .