What is the fine-grained topic of the following text: I'm an experienced mastering engineer with more than 1,000 projects under my belt, including work for Sufjan Stevens, Benjamin Gibbard (DCFC, mixing), The Shins, Nathaniel Rateliff and The Night Sweats, Cold War Kids, Pedro the Lion, David Bazan, Starflyer 59, Kristin Hersh, Clap Your Hands Say Yeah and Damien Jurado. Only return the topic.
Mastering engineer's experience and projects