Before you dive in, go here for an excellent breakdown of trailer music terminology by Trailer Music Academy.
Trailer Music Information
Ever wonder what music cue was used for a particular trailer?
Sometimes the answer is in the YouTube comments, but here are some more resources:
Trailer Music Companies
High end trailer music companies operate on “needle-drop” licensing agreements which means music cues are licensed on a per use basis. Unlike sites like Premiumbeat.com, there’s no library that you simply purchase and then use willy nilly. That said, the music does get out there, and some of the sites now have flexible licensing options for people with lower budgets or decide not to monetize their videos. Here are some examples that I know of (if you know of more, please let me know!)
Immediate Music - Professional trailer music library that allows non-monetized use on YouTube for free
Position Music - Professional trailer music library with flexible license options including for YouTubers
Audiomachine - Professional trailer music library with flexible license options including for YouTubers