What is the fine-grained topic of the following text: Mayer Hawthorne:- Andrew Mayer Cohen (born February 2, 1979), better known by his stage name Mayer Hawthorne, is a Grammy-nominated American singer, producer, songwriter, arranger, audio engineer, DJ, and multi-instrumentalist based in Los Angeles, California. Only return the topic.
Mayer Hawthorne's Career and Musical Contributions