Esoteric art, art that conveys a message only to those educated in its interpretation, exists in every medium and classical music is no exception. While music can convey emotions and narratives to everyone, history offers many examples of composers hiding messages and symbols in plain sight for those with the knowledge to interpret them.

This week on The Classical Station, we’ve dug through our extensive collection of great classical music and selected just a few examples of classical composers embedding coded messages in their works. We hope you’ll enjoy our selections and – who knows – maybe your favorite symphony is hiding something unexpected, if only you had the key to unlock it.

Baroque

The great master and progenitor of counterpoint, J.S. Bach, was also one of the first to employ “musical cryptography” to hide messages in his scores. Towards the end of his career, Bach began using the German musical alphabet (which uses “H” to indicate B♮ and “B” to indicate B♭) to insert his last name B-A-C-H (B♮-A-C-B♭) into his compositions.

B – A – C – B♭(H) is used to hide J.S. Bach’s name plain sight.

Originally employed as a sort of musical signature and “easter egg” for fellow musicians, this technique later became a way for composers to reference and pay homage to the godfather of classical music.

Never one to sacrifice musicality for meaning, the progression itself—B♮-A-C-B♭—starts with dissonance and moves toward cathartic resolution. This philosophical and musical theme is a recurring motif across Bach’s career, and thus the run of notes acquires a doubled signatory significance.

Classical

Wolfgang Amadeus Mozart’s operas and programmatic music are rich with characters and symbols apparent upon even cursory examination, e.g. the talking statue in Don Giovanni. However, for those familiar with the symbols, philosophy, and rites of the Masonic Brotherhood, his final opera, The Magic Flute, holds a special message.

Mozart “hid” extensive Masonic imagery throughout the opera. In fact, the references are sometimes so overt that one wonders whether he was playfully subverting the famed secrecy of the organization.

The story of The Magic Flute contrasts the forces of “light,” embodied by the heroes Tamino and Papageno and their three guides, against “darkness,” represented by The Queen of the Night and her three attendants. The idea of light and illumination versus darkness and ignorance is core to Masonic philosophy. Additionally, the three virtues faith, hope, and charity – and their opposites – are recurring triads across the imagery of the brotherhood.

While these connections may seem tenuous in isolation, taken in light of the opera’s many other references to the secretive organization, it is almost certain that Mozart intended their Masonic connection.

Modern

Olivier Messiaen took musical cryptography to a new level in the 20th Century, transforming it into a theological practice. A devout Catholic, he not only devised a 26-note cipher to encode sacred texts—most notably passages from Aquinas’ Summa Theologica—but also integrated Hindu rhythms, adapting their philosophical significance into a Christian framework.

In his 1969 work Méditations sur le mystère de la Sainte Trinité, this complex transliteration reaches its peak, with entire theological passages transcribed into music.

Far from an abstract intellectual exercise, Messiaen’s approach to musical cryptography was a form of spiritual devotion. By encoding phrases like Dieu est immuable (“God is unchanging”) into dense counterpoint—alongside detailed transcriptions of birdsong and other “samples” from nature—Messiaen hybridized his composition with his prayer.