Harmonex

Now we'll never get the Rock Band Network DLC back...

Harmonex is known as the Singing City on Cybertron, where it serves as a center for art and learning. It holds within it lithic crystals that sing in perfect harmonic frequency.

Fiction

IDW Generation 1 continuity

During the war on Cybertron against the Decepticons, Scorponok became responsible for unleashing the dreaded engine of destruction known as Trypticon that made its way towards Harmonex. Ultimately, as the beast approached, it was believed that the Singing City would be lost in the monster's rampage with the city's songs being forever lost to Transformer kind. After evacuating Harmonex, the Autobots lured Trypticon to the city's gigantic central structure and collapsed it on top of him, The Illusion of Control but the beast survived unscathed and continued his rampage through the ruined city. Annihilation

Ask Vector Prime

In ancient times, the Cannibal Baron ruled an empire that stretched from his seat of power in Corumkan to as far south as Nuon and as far north as Harmonex. Ask Vector Prime, 2015/09/15

Beast Wars: Uprising

Harmonex bordered the Rust Sea. During the Grand Uprising, the city fell to the Resistance. Safe Spaces