McCreary's work on Battlestar Galactica was so acclaimed that he ended up performing to thousands of people in huge live shows.
McCreary rose to fame with his offbeat, atmospheric music for Battlestar Galactica. After working as an assistant on the 2003 mini-series he became the main composer for the show itself, staying with it all the way until its conclusion in 2009. He returned for spin-off shows and TV movies.
He also scored Terminator: The Sarah Connor Chronicles, The Walking Dead, Agents of SHIELD, Black Sails, Outlander, See, Snowpiercer and Foundation in television, and worked on films including 10 Cloverfield Lane and Godzilla: King of the Monsters. His video game work includes God of War and its upcoming sequel, and Call of Duty: Vanguard. He won an Emmy in 2013 for his work on the soundtrack to Da Vinci's Demons.
Amazon has released two full tracks from the soundtrack today: "Galadriel" and "Sauron," which I assume will be the leitmotifs for those respective characters. This may also be a minor spoiler, confirming Sauron will show up in the first season. That might feel like a given (Sauron is involved in the span of time that the show covers), but there was some speculation that Sauron might not show up until later. Both tracks are very good.