Fiction:
* The Sorcerer's Apprentice (fantasy, 1982)
* The Dragon's Dream (fantasy, 1984)
* The Dragon's Bane (fantasy, 1987)
* The Dragon's Fury (fantasy, 1993)
* The Dragon's Wrath (fantasy, 1998)
* The Dragon's Legacy (fantasy, 2000)
* The Dragon's Destiny (fantasy, 2002)
* The Dragon's Shadow (fantasy, 2005)
* The Dragon's Heart (fantasy, 2008)
* The Dragon's Soul (fantasy, 2011)
* The Dragon's Rise (fantasy, 2014)
* The Dragon's Fall (fantasy, 2017)
Non-Fiction:
* The Complete Idiot's Guide to Rock & Roll (non-fiction, 2000)
* Guitar Heroes: The Masters of Rock Guitar (non-fiction, 2003)
* Rock & Roll: The Definitive Guide to the Greatest Artists (non-fiction, 2004)
* The History of Rock & Roll (non-fiction, 2006)
* The Complete Idiot's Guide to Music (non-fiction, 2008)
* The Complete Idiot's Guide to Guitar (non-fiction, 2010)
* The Complete Idiot's Guide to Music Theory (non-fiction, 2012)
Other:
* The Dragon's Flight (anthology of short stories, 2007)
* The Dragon's Gift (anthology of short stories, 2010)
This list covers some of his most well-known works. He has also written numerous articles and essays on music, literature, and other topics.
It's important to note that the "Dragon" series is often considered his most popular work.