Several essays by Thomas on early 20th-century music are now available as part of a pioneering new reference volume Classical Music 1600–2000 – A Chronology. The book, edited by Jon Paxman, interprets four centuries of Western classical music, considering its evolution from different perspectives. Early reviews have given the book a huge endorsement:

“An excellent resource for students, teachers and composers at any stage in their development.” Sir John Tavener

“A great reference tool for anyone who wants to explore the history of music.” Philip Glass

“Lavishly designed … allows the listener and the student to enjoy both detailed and very zoomed-out snapshots of the overlapping political and personal conflicts that shaped musical history.” Nico Muhly